I’ve been diagnosed with MS (Multiple Sclerosis)

HI, I AM 38 YEARS OLD, AND I’VE BEEN DIAGNOSED WITH MS LAST AUGUST.MY MAIN QUESTIONS ARE 2.
THE FIRST IS THE LOST OF WEIGHT.BEFORE ONE YEAR I WAS 90 POUNDS AND NOW I AM 82.I AM TAKING TECFIDERA SINCE SEPTEMBER.
2.WHEN I WAS FIRST EXAM FROM THE NEUROLOGISTS, THEY done A TEST to evaluate cerebrospinal fluid AND THEY SHAVED MY HAIRY BACK. SINCE THEN THIS PLACE OF MY BACK NEVER GROW NEW HAIR BUT IT IS BOLT.WHY IS THERE SOME SPECIAL REASON..