well you cant do anything about it wearing a hat or not or putting gel in it will only affect the quality of your hair, not when it will fall or not. Thats genetical, written in your DNA, maybe hereditary. But I saw a documentary and sometime a bunch of cells in your scalp just die and then regrow later on, but yeah go see a dermatologist I think they are the ones that coul find a solution. Sucks for you man, i'd hate to have that problem