need tips for surviving school

ive got 2 weeks of school left and my depressions been really getting worse these days. i cant go a full day, much less a full week. i skip a lot, sleep through classes, smoke on breaks, but its not helping much anymore. i just want to feel better, and be able to function there, does anyone have any tips or anything? it just feels unbearable these days. also some more information, im 15, going to middle school, and cannot ask for accommodation here.