I’m sorry you’re going through this. I had this shit every single time when Doctors prescribed me SSRIs and SNRIs. I have been through this rodeo 6 times with 6 different trash antidepressants that did nothing but ruin my sexuality fully. I am not talking bout low libido, complete chemical castration, never getting horny even if I want to, never able to climax or even feel a thing. I had PSSD for sure. In my case it was not from MDMA but from SSRI (hence the post SSRI sexual dysfunction). So I know how it feels. It feels like you are castrated and life is over. The awful part is you stop the medication and it persists, sometimes for weeks, sometimes for months, the longest for me was a little over a year. Thankfully it eventually always returned once enough time has passed but the shitty part is it can take very very very long. After the last one I swore I never take another SSRI/SNRI again. Serotonin plays a very important part in sexual stimulation, ability to climax and horniness. Doctors downplay it but SSRI pretty much always have that side effect, the incident rate is low because most people are too embarrassed to admit it.
Now for your part. You said you have it after taking MDMA only once? That’s truly uncommon but I am not saying I do not believe you. What I will tell you though is that a lot of other hard substances won’t help bring it back magically. You mention opiates, as an opiate addict (which is what I am a junkie for) I can tell you they do not improve sexuality, in my case they do not make it worse either. It doesn’t have an effect on it generally. They will not fix your specific problem that I can guarantee.
It kind of sounds to me like you are trying to be sexually active (jerk off) while tripping which will alter your perception of it, maybe even falsely giving you the impression that it doesn’t work.
Apart from your drug experiments, do you take any medication? There are a lot of other meds not just SSRI that completely kill sex drive.
Do this: don’t try any more trip and jerking off experiments for now, go to a urologist (possible endocrinologist), say how much this negatively affects you mentally, if they don’t take you serious go to a different one (I had to switch doctors numerous of times), see if you have an issue with your prostate, testicles, etc. they will do an ultrasound, more importantly though, get a testosterone, prolactin, etc screening. You mentioned you have not done this yet, this is extremely important. If all still comes back normal and it still doesn’t work get Cialis (or a similar one) prescribed, take it a few hours before and try again. Sometimes pssd can be cured if you take this substance a few times before doing it, then it starts to work normally without. I can’t promise you anything but that’s the route most people go and I did so too, I also got cialis at the end but was too afraid for whatever reason to take it but after a few months of abstinence it recovered normally.
Don’t end it all. It’s not worth it. There is more to life than this. Remember sexuality changes throughout your life, everyone has phases with lower libido and higher libido.
If you are truly dead set on it I am going to be very bold here, before you do it, try opiates, I rather have you addicted to something you can later get treatment than dead, I was torn between s*icide and trying opiates (because of different reasons than yours but still). I chose opiates, became a junkie, got treatment later on and I am doing good in life now, my sexuality works too, I am so glad I didn’t end it all because you can never come back from death and death is literally the worst outcome. Do not end your life.