I don't think you have MS but I do think your body is telling you it needs help. I pray you find real answers and help. You work around a lot of stress and chemicals. Try detoxing but be ready because it won't be easy. Unburden your body and help it heal itself.
Without examining you I cannot determine if you have MS. However, given the new symptoms it would be reasonable to have another MRI of the brain, and the cervical and thoracic spines to look for disease activity. If new activity is detected, then treatment may need to be initiated. Perhaps a consultation with a MS specialist would be reasonable. MS specialists evaluate patients for this concern everyday, and if MS is excluded, then another cause will need to be determined. Good luck.