Is this normal?

I had my period 1 weeks ago and and for the last 3 days I had really painful discharge that was brownish and I had really bad back pain down by my tailbone. But today I started my period again and is really hurts. I have really bad cramps and the back pain is worse so yay double the pain down there, and I’m having bad headaches and I feel dizzy and nauseous. So I don’t know what I should do. Should I go see a doctor?