I have trouble breathing when i sleep on either side.?

I have trouble breathing when i sleep on either side of my body, it like masks my breathing, and sometimes i weeze a bit when i breathe if i try and sleep on either of my sides, the doc said i had some bronchitis and asthma, and i live in a town with shitty air, hanford, ca...this is unfair to me...ive been through so much pain in my ******* life....i cant stand it anymore...i just wonna be a normal ******* kid...im not saying that there arent kids worse than me...im thankful i dont have cancer or something awful like that, but ive just been through too much, more than the average kid....and i hate it...im depressed and upset. i cant sleep at night, its very hard...the only way i can sleep if if i sleep facing up, its impossible to sleep on my sides....whats wrong???