Is this normal?

I have this chills accompanied with fever for the past 5months now. I only feel better when I take Tylenol. I have gone to see the doctor several times and they keep telling me that nothing is wrong with me. I feel so cold even when the weather is ver hot to the point that I sometimes shivers. My primary care giver is not taking me seriously. She keeps telling me that all my blood work came back normal. Is this normal after child birth? I'm planning to go the the emergency room. I'm tired of hiding under the blank to keep