Cotcha, can you be my doctor please?

You're a down sight more useful than any of mine round here. No seriously though, thanks for that information.
My apologies for kind of losing it in my previous post, I hope no one thought it was directed at anyone on here, it wasn't.
I'd recently got back from the doctors where he'd had a bad morning and was taking it out on me, dismissing all my perfectly valid fears with a detached nonchalance and acting like all this physical and subsequent emotional dysfunction was pie in the sky. So I was rightfully pissed off.
Past couple of weeks or so have been weird. Not a lot of improvement. Symptoms seems to come and go. My eating, urination and passing stools was fine for a while, now my poo is all choppy and stringy or little clumps again, half formed. Still have a reasonable appetite and don't have too many problems with urination. Sleep is all over the place but I've never been very good with sleep. I either sleep twelve hours waking up three of four times or sleep solidly for 5-6 and wake up for good.
Sexual response is weird. Bar a couple of days of dysfunction I can generally, with a bit of time and effort, get an erection, and can ejaculate. Less sensitivity and pleasure in the act than before but I can get there. But the orgasm is totally devoid of any real pleasure. I rarely sometimes do get that nice, sleepy feeling thereafter but rarely. Otherwise, nothing. Kind of sad, if I do get with a girl again any time in the future this is the symptom that gives me the most fear. That I might never experience a proper, wonderful orgasm again. One friendship that had the potential to be more has already died due to me feeling lousy and insecure because of this.
Still get the tingling in my arms/hands and leg/feet, heck my whole body, maybe a little less than at the start, and muscles still hurt on and off a bit, and also a lot of deadness. A week last Wednesday, I took my mirtazipine before bed. It seemed to hit me really, weirdly hard, I could barely walk, my legs were all over the place. When I did get to sleep, I woke sometime later startled, and my whole body was paralysed all over, like I literally couldn't fucking move. Had to spend ages moving my limbs to regain any movement whatsoever. Thankfully this hasn't happened again, but it terrified me. Still also get that irritating 'vibrating' like feeling in my gut and groin shortly after any reasonably sized meal, usually dinner in the evening, usually last an hour or two.
Troublingly, I've also noticed my heart beating way more obviously, tightly and deliberately, usually when lying down. I do have high cholesterol so I initially dismissed it to do with that, but now I think it could be to do with this. One of the most stubbornly persisting symptoms is a feeling of 'numbness' and 'tension' in my jaw usually before, during or a little after eating. Also sometimes when looking directly up or down. I generally don't have a massive trouble swallowing food as such, but the feeling in my jaw is horrible. Again, maybe not as painful or severe as it was at the start, where it felt like my jaw was in a vice, but still very noticeable. It's kind of like the numbing you get when you receive anaesthetic at the dentists, but more like a stiffness, tension, and feeling like it's inflamed even though it's not.
I'm starting to swing more to this being Neuropathy than full blown MS. I'm still scared it is something more severe, but, I mean Neuropathy isn't exactly some light hearted walk in the park is it, heh?
I'm interested in pursuing the more unconventional means Cotcha suggested, but I'm currently unemployed, voluntarily. My dad was diagnosed with terminal lung cancer this year and the diagnosis, coupled with some messy relationship stuff caused me to have one of my OCD breakdowns. I had to leave work to recover for a couple of months and the relationship ended. I got to go with my dad to all his chemo treatments and spend some quality time with my friends that I hadn't seen in months due to work. But I also kind of acted outside of my nerdy homebody character and went to all night club nights and smoking weed for the first and subsequently a handful of other times. This culminated in me trying MDMA that fateful September night and well, that's why I'm still here seven weeks later.
But yeah, I have enough money saved to look after myself so I can avoid the dole office, but I'm in no fit state to work currently and I'm a little fearful of pursuing potentially costly private treatments or consultations with people not part of the NHS. But if it's helped you I guess I can look into it. Next Saturday will mark two months since the incident. If I haven't seen any noticeable improvement I'll go back my doctors see what they suggest, but if its another frustrating dead end, then I might look into it. I can't moan about feeling like cack all the time then not do absolutely everything to try and make myself better.
To like give me some glimmer of hope, you're basically saying with the right combination of physical therapy, abstinence from any kind of 'hard drug' or maybe even some lesser ones (beer/caffeine etc.) and a more positive and healthy outlook people can see some improvement in neuropathological symptoms?