Turning down the 'tism via drugs.
As a reminder, this is not clinical advice, this is just what works for me.
What works for me, and this partly controlling the rampant anxiety which comes with the continual torrent of information received, and the over zealous processing / predicting which goes on 24*7, you know that 40%+ extra thinking which goes on! It also helps in a pinch when you walk through the door after work or just out and people.
As a baseline control there are a couple I used, Valerian aka Kalms in the past, worked fine, however I then moved onto a "supplement" which is 5-HTP Complex, which also contains Valerian, Magnesium and B6. For me, this was life changing, the combination contained in this supplement meant that for the first time in years I could sleep more than 4 hours a night, that it would just make life bearable. I started taking this before I knew I was autistic, and now I know, it makes perfect sense. A couple of these a day and I'm a different person, confirmed by others not just my internal view. These calmed my shit down enough for me to function.
Don't get me wrong, 5-HTP isn't the perfect solution, however I did discuss this several times with my doctor who assured me it was good for me in all the right ways! Don't get me wrong, this isn't a magic bullet to de-'tism myself, this just turns down the volume on it all a bit. I also still have the usual problems, sensitivity to sound, touch, crowded places, too much light, people lying, breathing etc - the usual stuff which will make an autistic person go crazy.
After the 5-HTP kicked in for the first time, it was almost magical, it toned down my misophonia to the point where I could function for up to a whole minute in an environment where someone was chewing and breathing at the same time, or whistling. It would give me enough time to mitigate the noise, you know - put on background music, or headphones, or calmly leave the room. Without it... oh man... the walls would close in, I'd start shaking, irrational rage kicks in, loss of control would follow - concentrate... yeah that'd be a laugh... but 5-HTP gives me those seconds to scramble around and mitigate it without wanting to decapitate the chewer. Don't get me wrong, they're still an animal - chew with your mouth closed and breathe through your nose! (some people can't due to medical reasons, so you just have to deal and mitigate).
VITAMIN Pills. When autistic, from my own experience, a balanced diet largely consists of a limited number of foods, which probably won't provide your body with everything you need. CostCo sell a massive tub of pills for a low price which lasts almost two years at one a day. Since taking the pills, for the last two years I've not had a cold. Do yourself a favour and take a multivitamin daily, then it's one less thing to worry about mentally that you're not getting what you need. As a side note, also remember to drink and pee.
Alcohol. Yes Alcohol is a solution ;). I say in jest but it does work, yes it's bad and good, and all the jazz which surrounds it. Walking through the door after a day of people or stuff, and a cat will meow innocently, the walls will close in, and the rage comes on. (not at the cat!) I'll start having a meltdown, screaming, losing higher functions. The worst part of it is I know it's not rational or logical, but it is what it is and I can't stop. This is an external meltdown, sometimes they're internal where communication gets turned off. Neither is pleasant for people around you! Alcohol helps. For me, personally, a quad vodka (4 shots - 40% ABV * 100ml) with Pepsi Max or another sugar free mixer, well it goes down in around half hour, and my stupid 'tism brain goes ahhhhh, slouching around at the back of my head. Most importantly the meltdown melts and I relax. I don't carry on drinking (unless I just want to!) generally, it's just enough to take the edge off and go back to normal.
From what I've read from other's personal experience, it's a common thing for Alcohol to tone down the 'tism, allow you to have a clear head for a short period of time, to stop over processing everything, and spinning up 17 universe simulations for the passing nod off a stranger on the other side of the street three Tuesdays ago, and it was raining, a black BMW was speeding and a child was in the back seat. You get the picture?
Each to their own - the point of this is to go find what works for you as a unique individual. Be careful, discuss with a qualified clinical practitioner. Be aware that not all clinical practitioners will have the same opinion, so a second opinion is always a wise choice.