Over here in my part of California, I am happy to say that the ants are tiny and harmless. They never exceed 2/10ths of an inch long. I went to Pennsylvania once and was startled at the size of the ants there.(my personal enemy #1) fire ants.
Poison ivy sounds terrible! I hope you get better soon.

So I was prepared. It still got me anyway... many times... I still can't reliably identify it to save myself. I either think everything is poison ivy, or nothing is.
(Yes, some ethanol was involved too…)