Take a Benadryl/ 25 mg drink fluids and use the “FMEEHA” method from Jack Lemmon:
https://www.youtube.com/watch?v=f_5nHV8FJyI
All I can say is the damndest autumn mosquito kept me scratching and worrying there was an infestation of D’s, I mean, fleas, and 2 benadryl’s at night barely stopped the itching!