Need help!

I had a csection 4 days ago and ever since I am constantly getting cold chills so bad I start shivering. I shake so bad it feels like I'm having a seizure. Then not long after I'll be so hot and start dripping in sweat. It's a constant back and forth cycle.  I can't sleep and I'm so uncomfortable. And now getting headaches from it. Why is this happening and how can I make it better?