Can someone who had chronic lyme disease and has been treated for it & still has neurological symptoms, bladder dysfunction & pain possibly have ms?

Multiple sclerosis: Yes. A person with treated lyme disease can develop multiple sclerosis. Having lyme disease does not protect your from having ms nor it increases the risk of having it either. Bladder dysfunction and pain are seen in many conditions and are not specific of multiple sclerosis. The diagnosis of ms may require certain period of observation or perhaps a lumbar puncture. Check with a neurologist.

Vaguely possible: But most likely, the Lyme is not fully controlled, or you may have an additional co-morbidity. I feel that you would do well to see a pain management specialist, and that could be a neurologist who focuses in that area. Not convinced that you describe MS.