Suggest Treatment For Weakness Of The Right Arm

Hi. I m getting weakness in my right arm. Had it before about 3 years ago. Neurologist said it was a virus(?) causing demilentation of the nerves in my right arm. We caught it at the end, did nothing except testing and the arm re-milenated over 6 months as predicted. Dr. said he would have given me an antibiotic to stop the nerve damage had we caught it earlier. Yesterday while exercising I noticed that my right arm was again weaker than my left arm. It is early in this process, day to day an unnoticeable difference. What can i do to nip this in the bud and prevent full weakness. Normally, my right arm is dominant and stronger than my left. Thanks for your help.