Be VERY careful how many flea products you use on your cat. TELL the vet what you have used so far in case he wants to prescribe something else. You can KILL a cat with multiple doses of flea product!!!
By the way, just for info's sake, you do not see flea eggs on your pet (fleas lay their eggs in the environment, not on the animal) what you see is flea "droppings" (flea poop...so to speak).
Best of luck with kitty.