Fleas are driving me crazy.

I live in rural CT with 3 dogs and a cat and have never had a problem with fleas until this year. I don’t know what happened but they just won’t go away, and I’m getting tired of it. We’ve tried collars, sprays, medicine, pesticides all of different brands, spending upwards of $900 this summer. I just really don’t know what to do anymore. I’m honestly thinking of fumigating the house and lighting the surrounding forest on fire to get rid of these little bastards.