Sorry Bmaez, I don't have a fix for you, but I feel your pain. When you asked "if anyone has experienced rolling around in insulation" it brought back some memories. About 3½ decades ago (Damn, I'm old!), I worked for a company for about 8 years that made fiberglass storage tanks (from 30 gallons to tens of 1,000s of gallons). We would have to do a lot of grinding, inside and out, to seal the head to the body, install baffles, flanges, manways, lift bars, etc. We'd be covered from head to toe with fiberglass dust after grinding. So yeah, I know that itchy feeling you're having. Now imagine your irritation, intensified . . . greatly. The worst parts were the beltline and inside of the forearms. Ugh! I don't miss those days.
Anyway, someone here please help Bmaez. That fiberglass itch sucks! Good luck on a fix.