What can happen if i stress myself out too much?

HI i'm 16 and i'm a senior. i've just been going through a lot. my dad lost his job my mothers in school trying to become a coder. and its been really hard on our family. ever since my dad lost his job and our house. i've just been so stressed out. i worry about everything i just took the SAT's and i feel like i bombed it. i have to fill out scholarships to afford a University tuition, room and board, to better myself and not turn out like my parents. i have an A.P cl that i have to do really well in if i want that college credit & on top of that i've been getting headaches like crazy.i feel like i wanna scream and burst out in tears because i loss so much and things just arent going as i planned.i know ppl tell me your so young you shouldn't be stressed out like that but what can i say? life is hard. does anybody have any advice before i make myself sick by stressing too much? thank you