I Have Continous Severe Pain In My Jaw Bone, Right

I have continous severe pain in my jaw bone, right ear area, sometimes right neck below my ear and sometimes my neck. I have daily headaches above my right eye. It feels like my jaw jumps out of alignment and feels like I have a mouthful of tinfoil. I had a root canal on an upper right tooth 6 months ago but 2 xrays showed nothing per my dentist. What could be causing this?