Am I Allergic to Rain? New life threatening allergy popping up in my twenties

i have had a recent string of allergic reactions in the last 2 years (i’m 23) that i’ve never had and i have no idea what the cause is.

the first time, i was sitting outside in shorts on some wooden steps, it had rained and the wood was still damp, after only a minute or two i feel terrible stinging on my thighs that only worsened, turning into swelling in my thighs and tongue, my hole body itched including the inside of my ears, i was rushed to the hospital, told i was going into anaphylaxis and stuck with adrenaline, i was sent home with nothing further and chalked it up to ants.

the second time i was sitting outside, again in shorts, and was sat it a slotted metal chair, again, wet from rain. immediately felt the same stinging on a smaller spot. i took a Benadryl immediately, my leg was on fire all night but it never worsened.

yesterday, i was standing in some grass while it was raining. A twig somehow got in my sock, which i dug out expecting a big because it stung like crazy. Nothing, just a wet stick. the small area on my ankle was swollen within an hour, and still itches 24 hours later.

is this a specific allergy or should i start picking out a name for it