Flea help PLEASE!!!?

I took in 4 stray kittens raised them till they were 6 weeks old and found homes for them. Now I have fleas. I have had an exterminator here twice, done all the required cleaning, used 7dust and borax. I have spent over a month cleaning my a** off and I still have fleas. Funny thing is, after treating my home we don't see any fleas for a week, then they magically reappear. Can anyone help? I am on the verge of a mental breakdown and have no clue what to do. In total I have spent around $200 trying to get rid of the fleas. I am disabled with a heart condition and 2 children to raise. I am at my financial end. Please only serious answers!!!