Chlorpheniramine or Loratidine(Claritin) would be your best bet. Chlorpheniramine(or Chlor-Tabs at Wallyworld) won't make you tired or hyper(unlike Benadryl), and is very inexpensive.

Doesn't hurt to try!

(Disclaimer: my mom's a pediatric RNC, so no worries of death or dismemberment)