My body is freaking out. Are these common caffeine withdrawal symptoms?

I recently decided to cut Dr. Pepper out of my daily routine. During the day, I’ve typically consumed around 3–5 cans of the sugary substance.

I started this 5 days ago. I’ve had a few cups of coffee and a little Dr. Pepper, but I’ve been pretty good about staying off. I was an occasional smoker and I also gave that up. I’m also leaving my current job for a new one.

So, with all that said. Is it common to have migraines, shivers/shakes, lightheadedness, and a fever? It comes in waves… usually at night.

Any thoughts or suggestions? They would be appreciated. Thanks.