My exact thoughts. I relate to pretty much everything that has been said in this thread but this post I could have written myself.
When I moved back here to finish my studies I wanted to find another therapist and see if I could improve my situation, but then I thought about it and said fuck it. I've been on this merry-go-round for half a decade. I'm a miserable suicidal wreck, I see a shrink/take some new medication, things go well for a while, I start feeling hopeful for the future and then inevitably something goes wrong or I fuck something up immensely and it's back to square one.
Now, some of my fuckups I can't bear to live with anymore and that's my main reason for wanting to ctb, but even if I could, I'm tired of living on the hope that someday things will get better, tired of spending time, money and energy on trying to improve my situation when it's clear as day by this point that I'm too fucking broken to function. You can only spin in a hamster wheel for so long.
So now I just do everything I can to chip away at what's left of my sanity so I can speed up the process. I'm borderline alcoholic, self harm like crazy and have a creeping addiction to benzos, hopefully all of this will push me over the edge within the next year/year and 1/2.