Lice help asap

I’m 18, I shower every other day & it’s always been that way. Recently, my head has been itchy like CRAZY. I thought maybe it’s the new shampoo I’m using or the fact that I’ve been using a huge amount of hair products (mousse, hair growth vitamins, hair spray for balayage, & a hair conditioner, and a gel that lays your edges) all at the same time. I assumed at first that it was all the chemicals but idk now. What can I do? Any products I can use to kill them?

Edit: yes , I scratched my head (close to my ear & took one out)