Four months ago, I began to have these episodes, mostly in the late morning or late at night, which began with tachycardia and then severe nausea and then profound weakness. I'm being treated by a GI surgeon for fibromyalgia (he believes it is traced to a common virus and has a new treatment protocol for it), and he diagnosed the attacks as gallbladder. I had a couple of surgeries, took a while to recover from them, and the attacks started again. At first, because of the nature of the surgeries, it was the nausea that seemed most prominent, but now it's the tachycardia, dizziness, and weakness that seem more debilitating. I have tachycardia upon rising in the morning, but the full-blown attack doesn't begin until a few hours later, and I feel weak and sick in a way I've never felt before. I can only lie around and wait for it to pass. Generally I feel more human around late afternoon, early evening. This has begun to be a pattern. The GI surgeon says this is the fibro virus and has me on anti-viral medication. I saw a regular GI doctor, who performed an endoscopy recently, and his theory is bile in the stomach. While searching for my own answers, I came to webpages about POTS, dysautonomia, and this does seem to me, based on the various descriptions, like the sympathetic and parasympathetic nervous systems are out of whack. I'm a teacher and have been on summer break, so this happened during a low stress period. I fear I will have to take a medical leave and am considering an appointment with the nearest Mayo Clinic. I live in an area that isn't rich in out-of-the-box or off-label thinking about mysterious ailments. The doctors I've experienced here are very conservative in their view of health and the body. I imagine the next specialist to see should be a cardiologist and/or neurologist? Does any of this sound familiar to anyone? Very grateful for any help or insight anyone might have.