 [ Symptoms ] what is causing my extreme fatigue and weightloss  i had a sudden onset of symptoms three months ago i have constant fatigue from the minute i wake up to the minute i go to bed over night i changed from being able to run for miles to struggling to get dressed without needing a lie down struggle falling asleep but fine once asleep body feels weak occasional leg numbness and i get muscle twitches in my legs and feet i originally had lots of palpitations but not so much i feel very spaced out weightloss of almost a stone   any ideas why  [ Disease ] hi this may be due to undernourishment the diet she eats needs to be iron rich bone marrow study will confirm and rule out any other cause of anemia consult a hematologist thanks