I noticed something new today and wondered if others have noticed they get dehydration which seems to be happening even when they've had a lot of fluid. I got picked up to visit CFS friend taking my 1Litre drink bottle with me which I drink in the couple of hrs I was there on top of that I had to refill it and drank half of that again. I also had a coffee while there. (so all up had close to 2L in 2 hrs thou i realise that coffee can dehydrate people). After a couple of hrs (in which I'd been sitting the whole time with my legs up on couch) of talking, I started to get unwell due to the excertion of holding convo with someone for that long.. so started feeling nausea and a general unwellness feel come in and a slight headache and sudden more sensitivity to things. So it was time for me to be taken home.. we went to leave only to have me collapse on the flloor as I went to stand.. my legs were shaking. My friend tried to help me up to get to the car but I just went down again, shaking still so ended up having to crawl out to the car. (I wasnt about to try again to stand and risk a complete blackout). On getting home.. I decided I'd best take my glucose level to see if it was low but couldnt get my fingers to bleed to do the test and noticed that my fingers were all wrinkly and indented like I was dehydrated. Something I shouldnt at all have been due to drinking about 5 cups of fluid per hr for the previous two hrs before. A couple of hrs after I recovered from the POTS attack and my fingers are all back to normal. Im assuming it couldnt have been "real" dehydration??? but maybe I had blood pooling in abdomen or somewhere and hence my fingers showed signs of dehydration?? any one else got any ideas of how i could of been dehydrated when I drank that much?? (im right now also trying to analyse my emotional reaction to the incident at the time.. I felt very very embarrassed and hence started to cry a little at the time about having to crawl to my new friends car. I would of thought I'd be okay to be seen to be crawling by another with ME/CFS so I cant work out why I was embarrassed to have to crawl in front of her? I cant make sense of why I was embarrassed to be seen having to do that?).