I'm wondering if what you have is a parasitic infection. Neem soap might help until you can order from humaworm. If you have an Indian market in your neck of the woods, they're bound to have it on the shelf. You can also get it online. If you can get your hands on some neem oil (health food store or indian market), you can add a few drops to your shampoo as well. Warning: It doesn't smell great -- pretty awful actually. But used regularly -- it might help.