I'm curious as to what's the best way to treat mod-severe neck pain?

Exercise: A hep and stretching with neck strengthening is the best. You need to balance the anterior neck muscles with the posterior neck muscles. Often , the posterior muscles are a lot stronger. Stretching also helps with warm moist heat to relax the posterior, tighter muscles. Sometimes, you may benefit from traction as directed by a therapist. This depends on the cause of your pain.