Period struggles

My period has been late for 42 days, i’m not pregnant but I throw up about everything, I get the sore nipples, get the weird cramps, like I am i’ve taken 4 tests and I’m not pregnant. I’m also very stressed with school, and life, college is sorta just a sector of its own and I love it but you know. Anyways what should I do it’s been about 2 months of me constantly throwing up. Doctor said I was fine, might be my pcos but pcos doesn’t have nausea as a symptom last I checked. I don’t know, someone help.