OK guys, here's another one I know has been posted on already but could not find much in detail about it by using the "search" option, so please forgive me for asking if it has already been dealt with here. I am back into another CFS flair and today I had a scheduled appt with my Endo for my Diabetes. When the nurse did the regular vitals, I asked her if she would mind checking my BP and pulse while I was standing. I knew there would be nothing really notable, but that is about the only thing that I have never had checked and could be the reason for this exhaustion and dizziness. She had no problem with my request and by the look in her eyes after she took the cuff off, I knew something was strange. She said that my BP didn't change significantly but it did drop, but my pulse went from 85 sitting to 120 when I stood. Is this a significant reading? I read a little about posturial tachycardia when I got home but could not find much info on how serious this is if that's something I have going on. I mentioned it to my Endo when he came in, but he said that was out of his specialty and that I need to mention this to my GP but he didn't seem too concerned. So should I? Thanks for any advice you can give me.