I've had my hair bleach blonde, than i dyed it to black but i dont like it black, HELP?

OK, so i thought i wanted to go to black hair, im a natural blonde. but ive bleached it lighter. But i wanted something diff. so i went to black. But now im not likin it as much as i thought, how do i get it back to blonde. Its already stripping down to brown and i havent touched it. Will it go back since blonde IS my natural color, and it has been bleached so many times? Ive only done those 2 colors. this is my first time going to black and i dont like it. HELP!