I have had this same problem. My daughter has long hair and I have long, very thick hair. She brought lice home and since I used my brush to do her hair, I got it as well. We tried Rid and Nix. Neither of them worked. I was pregnant at the time, so the thought of using pesticides over and over again was very disturbing to me. I researched online and found a few things to do. The hardest part is just doing it consistently.
~ Get a big bottle of rubbing alcohol to soak your brushes and combs in. I kept mine in a glass full of this at all times until ready for use. Then I returned the brush to the alcohol after use. It kills the lice within seconds. I even tested that (morbid, I know) by finding a bug and putting it in the alcohol to time it.
~ I soaked my hair in alcohol by starting with dry hair, and a bowl of alcohol. I saturated my hair with the alcohol and then wrapped it in a towel overnight. This killed both the bugs and nits. I did not have to repeat this at all.
~ Tea Tree Oil. I used this on my daughter. Dilute it with a little water and rinse the hair with it. Then wrap it in a towel. Also, add a few drops to your shampoo. It helps to keep them from coming back once you have gotten rid of them. You can find it at Walmart, Wild Oats, Etc.
~ Blow dry the hair daily. The heat dries up the bugs and nits and kills them.
~ Use a lice/nit comb morning and night to remove everything from the hair.
~ Vacuum the floor and furniture daily and either throw out or freeze the bag immediately. I have a canister vacuum, so it was easy to empty everything each time.
~ There are sprays for your furniture and house, but once again, it is pesticide that you are spraying in your house. I spoke with my pediatrician about these and was told that they really don't work very well at all and the risks out-weigh the benefits received.
Good luck with this. It is time consuming, but very effective.