Ohhh... I am so sorry for you... You might try Benadryl anti-itch cream, it is a topical, for the rash/hives, and take some kind of anti histamine orally on top of it, there are a lot of them on the market, some new, some old, if you have used one in the past that worked for you, you might use that one. For the nausea you might try a mast cell stabilizer nasal spray. There is only one on the market OTC. It is sold for sinus issues, but works in other areas that it comes in contact with... Be very careful to avoid the ants in the future, you avoided full on anaphyllactic reaction, but this bout could cause you to be more sensitive to a future attack, even if in the distant future. Oh, and ants hate urine... Old farmer trick to go around and pee on all the ant hills. (I know, sounds strange, but old time methods worked and were cheap and harmless to humans and pets). Put men in the family to work and you may be able to push those ant nests outward away from your yard and buildings.