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Hi Mrs O - I don't think that I'm dehydrated, but I might be a bit, as the renal people do not want me drinking too much, so I'm having less than I would normally. I feel a bit better now - I went and had a nap instead of going out!
PDG - when I started taking blood pressure tablets I did need them, and then several years later the doctor added a second pill to take - it's only a very recent thing having low blood pressure - and I'm a firm believer in White Coat syndrome, as several times in the last year I have gone to see doctors and it has been up in the 140's - 150's, and then calmed down again when I get home. I do have my own bp meter, just haven't used it recently because I must get new batteries for it. Thank you all for your responses.