Tren and deca are both 19-nors, meaning they have very similar side effects. I would seriously not recommend taking tren after deca fucked you up this badly, if anything it would most likely prolong your current issue. I ran deca in 99, had no issues (probably got lucky, no PCT, caber, nothing). Ran tren a few years ago and got tren dick - still had libido and could get hard but at some point during the deed it would basically just go numb and would take forever to finish. God love my wife, she just grinned and bore through it - then after she knew I wasn’t on it anymore, told me how much it actually bugged her (she knew I was frustrated with the dick issues at the time and wasn’t sure I wouldn’t get totally pissed if she said what was on her mind at the time). Had some issues with limp/numb noodle for a year or so after, and every now and then still have little ‘flare ups’ (at this point they are more likely mental).
Point being, don’t take another hormone directly related to the one that gave you these issues.
Question: aside from going for basic check ups and blood work, have you fessed up to your doc and told him the full back story on this? And then asked to see a specialist (endocrinologist or whatever)? While you will get a wealth of experience on this board(and a mix of decent and not so decent recommendations), I think your better strategy is to go to a professional and see what they can do - but I would recommend staying away from anti-depressants, as these are known to cause libido and ED issues in men as well.
Good luck to you, and keep fighting. Suicide is a permanent solution to a temporary problem, and this is a temporary problem (no matter how it feels right now).