34 yo m w/ chronic neck pain/ headaches since 2000. i think that i hurt myself "head banging" at heavy metal concerts. neck "popped." thoughts?

I would recommend : Getting evaluated by a neurosurgeon. A good history, physical exam, and possibly some diagnostics may help you figure out what is going on and what you can do to improve your pain experience.

Degeneration: May be related to chronic disc degeneration or early arthritis in the neck. You should see a spine md for an evaluation. This can be a physiatrist or spine surgeon- orthopedic spine or neurosurgeon. Most often this is effectively treated nonoperatively.