Severe heath sensitivity is characteristic of
MS, but happens in many other disorders as well. Also, to some extent
MS appears to be genetic, but this association is not strong, so family history isn't much help in ruling it in or out.
Have you been checked for Lupus, Chronic Fatigue Syndrome or Fibromyalgia? All these need to be investigated. Have you had blood work for Lyme Disease? What about thyroid problems, B12 deficiency, sleep disorders?