Frontline worked for a while on my cats then suddenly stopped working, now we use Revolution which is a godsend. It is a once a month spot treatment, but in my experience, tends to last 2 months plus. Advantage has never worked for us.
:iagree: Revolution is the best!! It's a bit more expensive but since I started using it we've never had a flea on our animals, or in the house and It's also supposed to kill some kinds of worms as well...yuck. You poor thing!! I hope you find an effectrive treatment for them soon. It's funny how some people get all chewed up by them and have these awful reactions when most people never have a bite. Good luck...