answer:Oh man, this sounds so familiar to me. About a year ago, I was having all sorts of ridiculous things going on. I was getting dizzy (like vertigo) spontaneously. I would be sitting at my desk at work, and all of a sudden ..voom!.. the room would be spinning, and I’d feel like I was going to fall out of my chair. After these events, I’d have symptoms of nausea and general yuckiness for hours, and occasionally days afterward (depending on how severe the vertigo was). I’d also get these headaches that weren’t so much pain, as just the feeling of a vice on my head. My mom and I refer to it as “tight head” feeling. I’d hang upside down from my bed, because that seemed to make me feel better. I also had weird chest feelings; I was convinced I was having a heart attack. I went to my regular doctor and had an EKG.. normal. She sent me to a cardiologist where I had an Echo-cardiogram.. normal. I had my blood work done to test for abnormalities.. other than my usual sort-of low sodium (which I’m well aware of) – normal. My doctor sent me to a neurologist where I had an MRI… normal (and now I have a nifty CD of my brain!) I also went to an ear, nose and throat specialist.. normal. The ear nose and throat specialist told me something very important: he said that he sees people like me everyday, with the same symptoms (more or less), who have had every test in the book done to them. The answer is always the same: no one knows why this happens. After all this, I developed my own hypothesis: hormones. I’m a woman, and my mom experienced similar things at my age (29), and my aunt did as well. After all these tests, I went on hormonal birth control. I’ve felt great ever since. I’m not saying that this is what is happening with you, or really even giving you any suggestions for tests. I’m also not advertising birth control, just saying that it has seemed to help me. I hope I’m not discouraging you, either. But I just want you know that I know what you’re going through and I sympathize. (I’m thinking you’re a woman, but even if you’re not, I sympathize… this stuff is crazy). Just try to stay as calm as possible, and not to worry. The worrying makes it so much worse (I would be up all night sobbing into my pillow because I was convinced I was going to die). Good luck!