First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
The symptoms that you describe are not specific for any single disorder. From your description I cannot place your chronic pain into a specific neurologic cause. Given your swallowing discomfort then testing for chronic neuromuscular disorders (such as myasthenia gravis) may be helpful. I would also suggest a trial on a medication that treats neuropathic pain such as neurontin, elavil, lyrica, etc to see if it improves your pain. I would recommend that you see a neurologist and your regular doctor for additonal tests/medications.
I hope this has been helpful.