hair loss

I've been losing A LOT of hair these past few weeks. Its not only when i shower either. When my hair is dry & i run my fingers through it, a lot comes out. I have thick hair & i just recently cut it. (it used to be to my butt now its to my boobs) im so upset bc i dont know whats wrong or why its happening. I usually lose a lot of hair bc i have so much f it but never has it been this much. I dont even want to wash it bc im scared ill loose all of it eventually... i take birth control but this just recently started happening and ive been on it for about a year now. I used to take OLLY vitamins but i recently stopped. I changed shampoos and that didnt help. Idk what it is and im worried. Any advice? Solutions? Explanations? 

(The pic is from just now when i showered)