I would guess that it is MS. I have spasticity on the left side of my body -- rib cage to toes. It is worse in cold weather. I also have been dealing with a sense of vibration over most of my body since summer. for some reason, it seems to be worse when I am tired. Neurontin or lyrica may help with the vibrations if you cannot tolerate them. As just mentioned, there are other meds that may help with spasticity. I take baclofen (10 me) four times per day. I t seems to help with my spasms, but does not really do much for the stiffness.