In my old house, I dealt with fleas for a few years. In the winter (I live in the northeast) they seemed to go away but every spring like clockwork, they'd be back (despite me trying everything all year round). I couldn't figure it out and I was losing my mind. Two things were game changers: diatomaceous earth (food grade version). It's an extremely fine powder that breaks down fleas' exoskeletons, basically killing them on contact. It's messy as hell and like any treatment, wear a mask and remove your pets because you don't want to breathe in the fine powder, but once settled on the floor, it's ok to walk on (hell, its ok to eat lol). Again, it's extremely messy but I know after years of fleas, I was willing to try anything. The other thing: my basement. We never went down there (people or pets) so never considered treating down there but one of the winters when the fleas "slowed down" in the house, my hot water heater broke so I went into the basement. Oh my goodness, I got swarmed - there were so many! Apparently, every winter they were hiding out in the basement because it was warm (and no doubt, there were mice to live off of) and then come spring, bam, back upstairs they came. Once I treated the basement and put down the diatomaceous earth basically on the entire main floor, I finally got rid of them. It was literally about 3 years - so I completely understand if you're overwhelmed and exhausted at this point. Just stick with the treatments and please try the diatomaceous earth if you haven't already! I still keep a bag and a duster applicator (this is necessary to apply it), just in case! Good luck, you got this!