During a backyard wedding in the Kitchener-Waterloo area, I encountered Poison Oak for the first time.
I took off my sandals, walked around my friend's parent's huge yard. I walked through this stuff 'poison oak'. Poison ivy, I know what that looks like, but poison oak, I was unfamiliar with.
Lordy! Lordy! My two feet and ankles were completely blistered like you wouldn't believe. ITCHY! I could have scratched clear to the bone.
Yes, Calomine lotion did help, but I had some Webbers Vitamin E cream, that helped almost immediately.
It's not pleasant, and well...it takes ages for it to disappear. Just be glad you weren't sitting on the stuff or sunbathing nude near the stuff.
Hope whatever you use, irradicates the itching and blistering.
Looks like everyone has given you some great suggestions. Some of those ointment/medications I haven't ever heard of, so this is good to know for my next visit to the wilds of southern Ontario.