Hi! I am a 31 year old female who about two weeks ago started getting heart palpitations and numbness in my left arm starting between my arm and chest. I went to DR and they tested my heart but said everything came out great. They did say that my muscle mass index was low and that according to my symptoms they wanted to refer me to a neurologist to get checked for MS. I freaked out. If anyone can help me with my symptoms I would appreciate it. Mainly I am suffering with a weak left arm and tightness in the muscles around the front of my food and down into my feet. I also am very tired. I appreciate it so much.