What are the procedures to diagnose a subtle upper neck injury? I have had an MRI which obviously showed nothing wrong. I am doing neck stretches that I was given by a PT but that's about it. I believe headaches I was having were due to my neck (as they would go away after I stretch well). I saw a physiatrist who suggested: first try stretching/osteopathic treatment, then if that doesn't work try topical ibuprofen, if that doesn't work try ibuprofen internally, if that doesn't work muscle injections, finally nerve block.

Are there other diagnostics that should have been/can be run? Other treatments that people have tried and that have helped?