Flea Allergy

Does anyone on here happen to be allergic to fleas? I haven't met anyone else that they affect like me. I get a big bump and it looks like scabies or something sometimes because they get me so bad. Yes, I'm positive it's fleas. And I sleep with my dog in my bed. We treat with capstar, but I can't afford to treat her monthly myself right now. We live with my mom who has 7 other dogs.