I'm around insulation in attics all the time, I hav a pretty bad rash that itches constantly on my arms. Is there any over-the-counter remedies?

Hydrocortisone, but. Otc anti-itch creams such as cortizone-10 and calamide lotion etc..Can help relief your symptoms, but without know what is causing it, i can't say that this will do the trick for you. Try them for a few days, if not better then you should consult doc for an evaluation to find out what it is that is causing your trouble. Good luck.