I'm worried because I have back and neck pain.

A few years ago, I hurt my back while doing strength training and went to the hospital, where I was told it was early symptoms of a herniated disc. I received physical therapy for a few days and did walking exercises, which helped improve my condition, but recently it has gotten worse again. Not only my back, but my neck also feels stiff, and I wonder if acupuncture at an oriental medicine clinic would be effective. I've never had acupuncture before, and I want to know what the pain might feel like during the treatment. Also, do I need to get acupuncture multiple times, or is it just once? I haven't visited many oriental medicine clinics, so I'm curious.