What Could Cause Lower Back Pain, Vomiting, Pelvic And Abdominal Pain, Constipation, And Loss Of Appetite After Menstruation?

Pains in lower back,vomiting, pelvic pains on both sides, tense stomach, constipation, can’t keep water down and haven’t recently been drinking tons of water, not really an appetite abdominal pain and vaginal sharp pains, and muscles and thighs hurt recently finished mensuration