Headache, nausea, frequently urinating, dull pain in back & stomach crampin, tired, period was heavy for one day then spotted. normally heavy for 4day?

Better check an HPT: If there is any chance you could be pregnant, check a home pregnancy test to be sure that's not causing this. You might have a urinary infection. The only way to know for sure is to visit a doctor and have an exam. best wishes to you!

Infection: Hi, please see a doctor for evaluation to make sure you don't have any infection included Urinary tract infection or pelvic inflammatory infection, best of luck.