Hi Blondie,
I don't blame you for panicking like this, I would be too! Itching is a good sign, means it's healing :) Try not to scratch at it though, it'll only irritate it. I'm sure you're going to be fine so much time has passed now, and the more time that passes the better you'll feel. We had a couple of wasp nests in our yard, not just one but two, couldn't believe it! I was panicking about this even after the pest people took care of it. The bloke that killed the second nest went right on up to the nest with out any protective gear on, I was gob smacked! Think he was teasing me though, cause he knew I was freaking, that fool! I have the same reaction as you when bitten by a bee or a wasp. It hurts swells up and itches, and I've survived. If you're like me the swelling might last for a week. Got bitten on the foot by a bee once and couldn't walk properly for about a week. That was probably cause I was bitten on the arch of the foot though, sensitive skin there. Just wanted to tell you this because I survived, and I'm sure you will too! If your stomach is playing up, it could be a reaction to the panic.
Take care, hope you're feeling better :)