J.☯.
Lice can only live if they are on a human host. If you left the house for a couple of days (at least 48 hours, I believe), there is nothing alive in your house.
My son came home from preschool with lice one time. We washed his hair and my hair (my husband and other son had nothing, so we did nothing). I washed the sheets, bagged the stuffed animals, sprayed mattresses and couches, vacuumed (all of these things one time only) and that was it.
You do not need to wash sheets every day, you do not need to do most of what you are doing.
Relax! You are done. Could this ever happen again? Of course. But you can't stay on edge forever at the off chance that it happens again. Relax and try to forget about it.
Live your life again starting ... now!