Where do i go if I think i have lice?

Yesterday night or early this morning at 1 am, i went to my bathroom, looked in the mirroe, flicked my hair and turned my head to look at the sink to wash my face. I looked back at the mirror and saw a tiny beetle thing crawling onto it. It was very black and wasnt like an ant with three parts [head, abdomen, thorax], it had a head and an almost oval body. I thought it came from my hair flick, so i freaked, and jumped in the shower and washed my hair with hot water and vo5 shampoo for about an hour and a half. I have jet black hair and combed it out afterwards, and i saw small whitehead looking things along with dandruff. Well, im not sure if its all dandruff. So do i go to a dermatologist? I dont have insurance. I dont want a hairdresser, i've had bad happenings with them before... And one hairdresser even yelled and laughed at me for something... So i'd rather go to a doctor... What do i do?