Why is my head so itchy?

OK so when I was littler I had lice * oh no* well after 2 years of battling the little bugs I finally got mad and let my hair get plain nasty.. I mean by the end of it any that may have surrvied the drit of not washing my hair in 3 month or brushing it and then have my mother cutting most of my hair off we burned my bedding and all my old clothes and we bagged up every thing and there was no more.. ok so now I find my head is itchy again but I have bought lice shampoo and there are none.. I have nothing in my hair but dry skin.. looking my head I see black dot.. they do not move just it itches where ever they are .. could it be a fungus? The BLue shampoo for dry skin does not work and I have tried everything under the sun .. I have went through my head 500000 times with a lice comb with oils and differnt things in my hair and all I get it dry skin on the comb.. also some times it feels like a spider or some thing big and bug like is in my hair but I havn;t found one thing in their .. I had my mother check me , my dad and my brother all check my head and they all say the same thing, just wash your hair with the BLue and it will stop itchinh.. my hair stylist would of told me if she found anything and she said I had dry skinand its not good for my hair.. and my mother is having the same problem .. anyone might know what it is and how I can fix it?

I use to have to same problem my head to use be itchy and see black dotts but I found out I defntly didn't have lice!! so then sooner later I found out I had dandraft I guess its like dry skin but yh and sometimes you imagtion lets you think that bugs are running round you head!!

so change your shampoo & conditioner because obouisly its not doing you any good. 2ndly never eva buy head and shoulders thtz the worst thing you can do to your hair ( Hair dresses say that). plus you should use like coconut shampoo and conditioner or tea tree shampoo and conditioner because its makes your hair healthy and shiny and gets ride of dandraft (to get ride of it the tea tree works best, plus if your still thinking im not sure and you think uve got lice, tea tree gets ride of head lice because they hate the smell and die)