I feel you man. I lurked on here about a year ago (and maybe a year before that) when I was feeling suicidal, but started to rebuild mentally. Then it all came crashing down about a month ago because nobody came to eat with me at lunch when I invited co-workers and friends and I sat all by myself eating at a restaurant (or they wouldn't come because they had shit to do that day even though I planned a get-together a week prior), and now made an account after hitting a lower low than a year ago, perhaps ever. We did eventually have the get-together at the same restaurant as everyone's schedule was opened up, so it wasn't totally their faults or anything as it was more on bad luck, but man the damage was already done. All that mental healing and work for fucking nothing, and everything came crashing down harder than that has ever before, and I don't feel sad anymore as I have before when I hit those deep pits, I just felt empty.
Anyway share me your story OP, I want to read about it.