I think something is wrong

So this is 3+ weeks that ive been on my period. Today i woke up in exruciating pain, my lower back and lower belly (basically where my uterus is) ache and if i lay flat on my back, i get this shooting pain. I dont have any health insuranncr so the doctor is out. my stomach is growling but i feel so nauseous if i ingest anything it woll just come bavk up. besides, im fasting today. hav a good day ladies.