Hello Jchartr,
To put it very "up front" - get yourself to a neurologist/spine surgeon. X-rays only show bone structure at best. I am not a doctor, however, in my humble opinion you need to have an MRI.
Search out the best spine specialist you can find (and I do mean a doctor with "M.D" in back of his/her name). Talk with people you know and find out which spine specialist they held in high regard, and which ones they did not like. If you are in an area with a professional sports team, give their office a call and find out the neurologist/spinal doctor they use for their players.
And sbout exercises - The ONLY way in my opinion that you should do exercises is under the guidance of a physical therapist. A PT will show you how to do the exercises and WATCH you do them in their facility. Even with that careful guidance, I wonder how many times I went home and did the exercises directed by my PT, only to find out at the next session I was not doing them correctly. Too many times.
I'm going to have all the GP and PCP docs down my back, but that's okay. I go to my GP for my yearly physical and when I have a cold or flu. That is IT!!!! For anything else I go to a specialist. Our bodies are why to complex for a GP to know everything in detail.
I hope you and others get the "message" in the above paragraph.
RichT