Have you been able to try the usual stuff, like going to a doctor, try some meds, go through some kind of therapy? If you don't want to die, you're at low risk of being coerced into anything, and you can just experiment a bit with what they have to offer, see if anything helps and drop what doesn't.
Breakups often hurt immensely, I'm so sorry you have to go through this. I've seen some needing years to heal and process but eventually being able to fully recover and enjoy the most out of their lives. Please don't take unrecoverable decisions unless you're really 100% sure there's nothing else you can do and that's what you want.
Edit: and I don't think you're worthless, but whatever, I won't convince you I guess.