You already have a lot in your arsenal you've discovered. So good for you! I also deal with a lot of this, part from being on the austism spectrum, and part from Lyme disease.

I am nowhere near as severe it looks like. I mostly avoid overstimulating things if I can, and if I can't, I plan ahead for decompression/rest afterwards.

And regarding the magnesium thing, I can say it has great validity. I've also found the spray of a good quality magnesium oil works far better and faster than oral supplements.

But be careful using it. It stings a lot on injured skin and mucus membranes and eyes...

I also eat a lot of highly nutritious organic eggs that I raise myself. I think that ingesting the magnesium carrier (eggs, greens, etc) is a far better way to utilize the magnesium than supplements. I think something is lost when a supplement is isolated from its carrier.

But the magnesium oil spray has been the best for me.