A couple years ago, I had these same issues you are describing... it really freaked me out to the point I was afraid to go inside a store alone, in fear I would suddenly just faint! And my legs were shaky and my heart was racing... my ears hurt as well. And sometimes, I just felt the world spinning. What's funny is that to this day, I refuse to believe it was anxiety! haha! I had nothing to feel anxiety about! I went to my doctor about it and I think I had some sinus issues at the time as well, so he blamed it on that... he also told me for my dizziness, to take that medicine for motion sickness. Eventually, it just went away, thankfully! I can't even remember if the medicine helped me or not.