Over a week ago, I woke up feeling really hungover, I don't drink at all though! I went to bed at 6pm, and woke up at 9am. All day I felt extremely tired, had a headache, felt thirsty dizzy and had slight diarrhoea with no appetite. I had this for 3 days, where i'd just sleep all day then I started to feel better. All week I was fine but then yesterday, I felt extremely tired again. My gp has booked me in for an urgent blood test in 2 weeks time and thinks it's something viral. I had a covid test just to rule it out which came back as negative. Can anyone suggest anything I could be taking or doing?