Patti
I have a 7 year old, two 5 year olds and a 2 year old. We have also had quite a problem with lice this year! We have also tried: Clear, Rid, Nix, a sonic combe, etc. I finally bought a new vacuum and persuaded my doctor to order "lindane" (kwell)! I think that we are finally getting a handle on it now! Maybe you can get your doctor to try the Lindane! Hope it helps!