Has anyone else experienced anything like this? Both yesterday and today, I have felt extremely nauseous whenever I'm standing or walking. If I lay down I feel better and when I'm in a sitting position I feel mostly better, but as soon as I stand up or start walking around, all of a sudden the nausea jumps into overdrive and I feel miserable! Anyone have any experience with something like this? I don't know if I should be alarmed or if this is just something that happens that I have to get used to.