HELP??!! my hair keeps falling out, how do i get it to grow out and thicken again?

kay, i have a really bad problem heree. my hair keeps thining out. like the front sides are slowly thinning outt and i can feel for myself that my hair is not as thick as it as used to be. i cut all my hair off about 2 summers ago, and i NEVER want to have to do that again. i had less than 2 inches of hair going into freshman year(Im 16 by the way) and it was AWFUL and then had to put in extensions. halfway thru sophmore year it started getting longer again so i took out the extensions an put in a perm and had it maintained every 2 weeks by my hair stylist so it was all good, and grew out, then around mayish i noticed it started thinning out again so i stopped all perming and using hot objects in my hair and decided to go natural and it thickened out again and curled and was all good again. but i washed it every day with conditioner and washed it with shampoo every 3 days(im african american, so this prolly wasnt a good idea now that i think about it) and now again its thinning out again and my hair feels like it has no life to it! and im really scared bc i really dont want to have to cut it all off again. its about to my shoulders but my front sides are thinning out and i dont know what to do! i have alot of thing going on this summer so i really need my hair to be back to the way it was. so my question is how do i get my hair to start growing thicker again and how to get it to have more life again. please helppp! i need my hair backk!