Damn good job you took that anti histamine the other night.
If anything like that happens again, Anti histamine STRAIGHT AWAY, it will not hurt you to take the tablet but not taking it can if the reaction is bad enough lead to other problems, particularly as you have asthma. It will be the nematocysts that caused that problem.
It is worth noting Truck that I had allergy tests at age 5 and at age 13, the allergy tests were completely different and since then I have Nickel and latex sensitivities. They can and do change with age, you don't seem to get rid of them rather get more.
You never know, if I had done the same with aiptasia, I may have had the same reaction.
I told you to expect dust, if you have an allergy of any description, dust always reacts for some reason, my immunology is a bit rusty otherwise I should be able to explain why.
Good news on the tanks cycle
Will be expecting pictures later