I just bought some mosquito bite medicine in advance to my trip to Oshkosh. One year I was bitten up and was driven nearly mad during the night with itching. So now I arrive prepared.
But this morning I watched a video on how to stop itching from a mosquite bite with a spoon.
Ok, so you take a spoon and run it under hot water until the spoon is hot. Then you put it against the bite and hold it there for a few minutes. Supposedly the heat draws out the stuff that makes you itch. Could be worth a try.