Oh, Vision, that’s the pits! I have gotten into the poison ivy on a number of our landscape/yard jobs and suffered greatly until a couple of years ago when I finally discovered something that actually WORKS on zappping those reactions: http://zanfel.com/help/
You follow the directions, and it’s literally a miracle how it stops the posion ivy/sumac/oak. It’s available at Walmart or chain pharmacy stores, and although it’s about 35 bucks for a 1-ounce tube, it is more than worth it!
I've had that same problem and searched all over for the poison ivy in the yard, but could never find it. I finally got rid of it by soaking in Aveeno in the bathtub!