Hi sand,
I've been reading along, glad you're alive.
Here is my take, for what it is worth:
You are having a very hard time, and have been for a very long time. You try to make yourself "better". It's not working. You are doing a lot of the right things -- exercising, helping people. (Getting heartfelt "thanks" has been shown to be a major route to happiness.)
Yet, it's not working.
What happens then is that people get weary of the drama. Not people here, they are stalwart, they are patient, they are amazing, but from reading this whole thing I can see how it would be exhausting to be your friend. Everyone (really, most everyone) has felt the depths you feel. Most everyone is willing to be sympathetic,
especially if they feel their sympathy will accomplish something. If the sympathy merely falls into the void and is absorbed, leaving not a trace, it is harder to come up with more sympathy.
How to change that situation? Make the sympathy accomplish something. How? Well, alcohol isn't working. Willing yourself to be "better" isn't working. Going to a counselor is your best bet.
You say that you don't want to, I understand that, but think of it this way -- by refusing to take a clear, accessible, and quite possibly productive route, you are throwing your friends' sympathy back in their faces. That's no way to keep friends.