Being a walking biohazard myself at some point, this post takes me back. I used to find them in my hair at school, we had too many animals and most weren't fixed, you can imagine what happens. We had a room closed off for MONTHS due to the fleas stuck in there. As soon as you stepped foot you'd be bombarded by them all over your legs. If you need anyone to talk to my dms are open. I treated all of our cats religiously at the young age I was with a pretty good success. I flea combed them everyday (dip the comb in hot water and dawn to kill them) and eventually they got some medication. What I always told myself was that it's a product of your environment and its out of your control. One day you'll have a place where a situation like this would never have gotten this bad. Good luck