There seems to be a huge increase in insect bites this year, or my and my husband's response to them. Exactly as you describe, CLKD.
I use a product called 'After Bite' (topical application, basically it's ammonia and a bicarb, which my daughter found to be effective when she was in Mexico). It stops the maddening itching. But I've also had to take antihistamine on a couple of days because the swelling has been so bad - one bite (that I must've scratched while asleep) on my calf really swelled up.
It's just weird. Climate change, I should think, some new insects making their way over here. That said, I've lived all over the world and never been bitten the way I have this year.