I had an infestation last year and was quite hysterical about the whole thing. Plus I'd been using a vet product religiously, Frontline Combo, only for the vet to tell me that fleas are developing an immunity to it.
It took me 3 weeks to get rid of the buggers. Here's what I did
I got new stuff from the vet - Stronghold - so turning cat into flea killing machine. I ordered 6 cans of RIP Fleas and 6 cans of Indorex from Vet Direct. I bought a bunch of hoover bags.
I get really bad allergic reaction to bites, I had to take antihistamines daily, so I spent 3 weeks with my jeans/pjs tucked into socks. I sprayed my ankles and all exposed skin with mossie repellant and sprayed over my socks for good measure. Visitors were banned.
I vacuumed one room at a time but before vacuuming sprayed the door threshold area. Vacuum room, move as much furniture as possible, spray thoroughly, close door on room and start on the next area, repeat, repeat, repeat. Then ventilate rooms. Spray into hoover bag, leave for a while then bin the bag.
I washed all bedding, soft furnishings and cuddly toys at 60 degrees. I threw out 2 rugs.
The most intense period was the first week then I eased off a bit.
I found loads of pupae in the grooves of our wooden floor under the sofa and under mats by the door. They were quite large, about the size of a grain of rice. More like arborio rice or pudding rice, not long grain.
They're quite sticky so I couldnt hoover them up. I sprayed round where they were then kind of squooshed them with a baby wipe and put the wipes into a lidded jam jar and binned it. The bastards started hatching too but got caught by the spray/squooshing. Ugh.
It was awful and I felt so dirty. DH and DCs were quite blase about it but they weren't eaten alive. I had over 20 bites just on ankles and some have left permanent scars.
Even now that the fleas are well gone I spray lightly about once a month after hoovering as an added protection.
Sympathies to you.