The poison ivy is back in my yard, after I rooted it out last summer and collected a bad case of poisoning. There is not as much of it this spring, but enough to give me trouble. Rooting it out is your best bet, and since you are sensitive to it, have someone else do it. The fact that there is less now than before shows that rooting it out can be effective, but you have to keep at it. All the old tricks on killing it remain, but it still must be removed after it is killed.
Coat leaves with a herbicide containing ammonium sulfamate, repeat as necessary.
Spray plants with a supersaturated solution of salt and water, on a warm, sunny day. Add dishwasher liquid, to make the solution stick to the plants. It's not so good for the soil. Paint leaves with vinegar. Repeat as necessary.