Am I having a reaction from a poisonous plant?
Sorry, I know a bit about plants but don’t recognise this one. But you do sound as if you’ve been poisoned slightly – it could have been a lot more serious! If anything like this ever happens again, seek medical advice straight away. There are many, many poisonous and/or allergy-causing plants routinely grown in gardens. Next time make sure you identify the plant before transplanting it! I assume you live in North America? (I live in Australia, so the species vary quite a bit.) EDIT: That detail about the hairs is interesting: they could be the source of the irritation, as in stinging nettles. Excellent descriptions, by the way!!