I've had similar thoughts. About 1 month ago I got a herniated disc in the lower spine while using the snow thrower on the driveway. The symptoms were somewhat similar to my MS symptoms except times 3. There was weakness in the left knee like I get from MS but worse. There was also pain which I never got from MS. I've been in physical therapy since then and that has helped quite a bit. One of the things my therapist does is put me in traction for 15 minutes per session. Decompression therapy sounds alot like traction. Basically they use a machine to pull my legs while holding my upper torso.
The MRI that was done on me only covered the lower spine, so I don't know if there are injuries in the neck. My MS symptoms first started 15 years ago as numbness in the fingers and thumb of the left hand. My thought was that I had a pinched nerve in the neck. So I was rather shocked when the neuro told me it was MS. But I've often wondered whether my guess about the pinched nerve was actually correct.