I am horribly allergic to poison ivy, my ER doctor said the only worse case they had seen than mine was from someone who burned it in a bonfire and walked through the smoke, and I only had it rubbed on my pillow by terrible people.

As someone that has their skin rip open profusely from touching the stuff... Dawn dish soap, wash liberally, dry with paper towels or a towel you wash with all your clothes in hot water immediately after.
Then aluminum acetate dressings or similar astringent to pull out the weeping and cool the blisters. Don't use antihistamine creams if you have open wounds, it will mess you up, stick with zinc oxide (calamine) and oatmeal baths to counter the drying.