 [ 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 ] i have plenty of ideas but i do not know you your medical history or have any way of doing a thorough examination and diagnostic work up something that you need you will need to see a medical professional ideas are not diagnoses and there can be hundreds if not thousands of diagnostic possibilities that could account for your array of symptoms