For seven year plus, I haven't completely take off my hair rather I cut it low and ...

... washed it with bathing soap. Suddenly I am losing my hair. Sometime I feel like something moves around my skull. Contacted a salon, a guy gave me this hair solution in Image to rub onto my hair. Someone says it contains menthol hence it should be tough on dandruff. But I don't think I have dandruff. The movement has actually reduced. I only feel it when I stopped to use the solution for days. But my hair still goes off when I try to comb or scrub with my hands. Does anyone know of solution to this so my hair can stop falling off. I want my hair back.