I was eaten alive this weekend and tried a trick I read online.
Apparently, the protein that causes you to itch can be denatured with heat.
So you take a tent stake or spoon and heat it up. I used my lighter and a tent stake as I was inside my hammock and it was easy this way.
You want to heat it up where it's uncomfortable but NOT burn yourself.
Anyway… it DOES seem to work and the itching went away almost immediately.
I was bitten so many times I'm not sure if it was 100% effective. Some of the itching came back but these MAY have been spots I didn't treat before because I didn't realized I was bitten in that spot (or I just didn't treat it).
Anyway… it's worth an experiment next time you're in the woods and itching.

