I periodically get this feeling like I'm dizzy but the room does not spin, I just feel like I'm imbalanced, like I'm on a slant. It's very disturbing. Usually it only lasts a few moments but last night it lasted several hours. I'm quite concerned about it. Of course I am convinced now that I have a brain tumor. I'm sure the 4 cups of coffee I had yesterday had nothing to do with it. But it's very scary. I'm worried it could be a stroke or an aneurism. Does anyone else have this problem? I have sufferred with anxiety symptoms for years, and have had this in the past but I just cannot shake my fears.