Does it mean anything if i start hyperventilating sometimes?

Lately I've been getting really stressed and some bad times have caught up with me, I've recently been caught up with police (no crime, I'm not like that) and they've just crowded me with psychologists and nurses and helping hands. It's not that i don't appreciate it, i've always been a bit dark, and i've self harmed and been very emotional, but lately i've been crying almost every night and started cutting more and i cant seem to help myself, i cant concentrate on my school work any more and sometimes at home i start hyperventilating at certain thoughts, I'm not depressed, but i do have some tendencies towards it, they say and i get really panicked, like I'm trapped somewhere, it feels like I'm claustrophobic, even if I'm not in cramped places. It's just a trapped feeling, and it makes me start crying and it's really unpredictable, could there be a reason? If there is could you tell me, if you need anymore information then tell me, or if you think i'm just overreacting. Thanks :)