I could give you advise on how to pimp your CV to make it look good but doubt that it would really help at this stage.
I sincerely believe that there is nothing wrong with you or your experiences. In interviews people just want to hear the truth. Along with this, all employers want employees who will be passionate about the work that they are doing while having the confidence that they can do it well.
So if you want to do something, rather focus on remembering and connecting with your past passion for what you are doing well. Which is programming right?
You see what happens in start-ups (speaking from my own limited experience) is that we forget that we need constant feedback and support from other people. When we first go out and do it on our own, we forget about this and end up missing that which we achieved in a formal business environment.
When we work as individuals on programs or projects like yours, we tend to get trapped in a certain repetitive level of thinking. At the same time we are bombarded with problems to solve, not only in creating a workable product but also in direct measurable aspects of our daily lives. Aspect like clothing and feeding ourselves.
As a result of this we tend to become much more emotionally involved in what we are doing. And ironically almost in all cases that I have seen, we tend to then invest our self-esteem in the program/project as well.
This makes us kinda unstable, in the sense that our emotional stability is not found in ourselves but in our actions. Almost a form of bi-polar with highs and lows depending on what is happening around us.
A good day in programming will create elation and joy, while a bad day in programming will create negative a zombie like blob of no emotion. And by the way, if a program that you are doing on your own does not constantly give you a ratio of 4:1 joy, then you are sure to become negatively reinforced, pessimistic and even depressed.
And like you have most likely have seen while working 10 hour days its hard to live a life that is in harmony with the 80% joy and 20% pain rule.
This roller-coaster is coming to an end, because its not fun anymore. With this it now creates a natural and quite obvious sensation of insecurity, questioning skill and value as a result of the failure to successfully complete your project.
With this all said and done, I believe that you do need rest, just like Christian in a previous post said, but with rest I dont think you need sleep, you need experiences geared to provide you with acceptance and POSITIVE REINFORCEMENT.
If we look at basic conditioning, you have a massive negative association to programming that has been slowly but surely been reinforced over the last year.
Its natural to feel that your skillset has no value and that your prospective employer will grill you and that nobody will want you because of this last year. I would feel the same if all I now see is pain and problems that I couldn't solve on my own. Then again, it does not make this association true.
I would advise that you take a 40 day detox in order to just reset your association to your skill set.
Do crazy small programming jobs to just get your confidence back. Do it free if it needs be, but don't let this break you mentally! Do something that takes a weeks worth of intense (10 hours per day) programming at most.
The more small tasks you complete the more positive reinforcement you will get. The trick is that you need reinforcement that is not from yourself, but from other people who's life you make easier through your skill and gift.
When programming these small taks/projects, make the room in which you program "happy". Have the correct lighting, make sure it is well ventalated, drink enough water and take a 5-10 minute break every hour.
In your breaks, make sure to breathe deeply and don't just drink a cup of coffee, stare out into a distance that is at least 100 times farther away from you than your screen.
As soon as you have some confidence back,- and have realized that programming is not the bane of human existence - start looking for opportunities to start playing in a crowd.
It will only be then when people will start enjoying interacting with you.
Nothing has changed with your skillset, what has changed is they way you think about it.
Remember that it is a skillset that has successfully fed you for 9 years.Right? So connect with your competence.
Recondition yourself in the mental mindset and frame that you are the person who takes the action that provides the results that creates good outcomes.
Aside from programming, start with some other activity that will help you feel better.
Start training, jogging, walking, swimming... whatever and set SMALL outcomes for this, for example, swim 5 laps, walk around the block or jog 2 km's.
Physical exercise will help stimulate feel good hormones in your body and help reflect on the good that has transpired.
I have a feeling that if you were in a better situation (most likely economic, support and interaction in a group) that you would still be at it trying to make this one work.
So the best advise that I can give is to feed your mind with hope while creating a supportive environment that feeds you both Psychologically (mental rewards and praise and recognition for good work) and Physically (cold hard cash).
We are all human man, we need it!
Great books to read that help provide hope:
The Science of Getting Rich - Wallace D Wattles
If you are a religious person, the go abstract and enjoy this one as well:
Its your time - Joel Osteen
Whatever you do, dont throw the project away, you will be able to use it in some way or another in the future. Believe you me, as soon as you are mentally back on track you will see that your answer has been there, waiting right in front of you, all the time!
Good luck with your future Albert, Looking forward to hearing and even reading about your success soon!