Back pain, lower abdomen pain, etc

I’m having pains in my lower back, my lower abdomen and it’s making me feel nauseous. It feels like period pains but I finished my period on the 8th of this month and I don’t start until the 30th. I haven’t been to a gyno yet but I need to because my periods are extremely heavy and painful. Am I the only one experiencing this? Please help, it hurts so much :(