how do you release a trapped nerve?

There's not enough information to make a specific determination.  Is this from an injury? Sleeping on your neck in an awkward position?  Depending on what makes sense in your situation, you could try acupuncture, acupressure, massage therapy, reiki, Vitamin B complex to support nerves, heat/hot water to start.  Focused, rhythmic breathing also helps release pain. Take 20 minute sea salt baths once or twice a day.