need feedback ASAP about a medication.

Elizabeth
Need your feedback ASAP!! 
I had my daughter in June and every since then my left part of my back tingles and it's very painful. Went to the doc and they said my muscle is very swollen. From holding the baby and breastfeeding and other things. She prescribed me Soma. Which I have never taken. Super nervous. Has anyone ever taken this? If so what were your side effects??