Flu shot symptoms !!!!

Okay I need advice ! Is this normal?!

I start a new job working in labor and delivery next week!!! Today I had to get the flu shot, I got the shot today around 3pm I was totally fine !! Around 9Pm tonight I started getting the chills with goosebumps I thought it was bc it’s cold now and I had no socks well within minutes I was trembling shaking sooo bad non stop freezing !!!I cranked the heat ! Put layers of clothes on took Tylenol ran to bed with multiple thick heavy blankets! I’m still shaking non stop !!!!!!! And my lower back feels like it’s locked ! I feel like I pulled a muscle in my life back ! Could this be a side effect of the shot ?!!