Hi I Am A 24 Year Old Female Who Over

Hi I am a 24 year old female who over the last 6 months to a year have been suffering from fainting and and shaking episodes. Small red spots sometimes appear on my hands and feel and bruise the area. most recently though I have lost a lot of weight suddenly and unintentionally. I know only weight 94 pounds. I have not had a period in over 5 months. small lumps have appeared on the back of my neck and are not painful or feverish to the touch. As well as having an increase in sweating, hands, feet, underarms, neck, back and stomach all day not really effected by the weather just made worse when it is hot. Need some help and ideas on what it could be, thank you for your time.