I sympathise with you as I can relate to what you're saying. I hate getting so depressed from over stimulation.

On the matter of bed sheets, I actually switched to 'jersey' sheets over woven cotton sheets a few years back and they make a big difference. I hate woven cotton sheets against my skin, I just can't sleep on them. Jersey sheets are knitted instead of woven and they feel much softer against the skin. Funnily enough, after my diagnosis I was doing some research about hyper sensitivity and found several places recommending jersey sheets for that exact reason, so I was ahead of myself on that one haha.