Cycle has gone haywire. Nausea and lower back and front right pain. All pregnancy tests are negative. Doc took me off pill - hasn't helped.?

More evaluation need. While nausea, back/abdominal pain and cycle irregularity can be menstrually related, there are many other causes that need to be considered including gastrointestinal problems (peptic ulcer or gall bladder disease, irritable bowel syndrome, etc) or genitourinary issues (kidney or bladder infection, stones, etc). Now need careful history and physical with your doc and targeted tests. Good wishes:)