I have vertigo feelings as well. Sometimes it feels as though the floor just quaked. Other times, it feels as though my brain shifted. And yet, other times its everything around me is spinning. Vertigo is such a weird thing and very different than just feeling dizzy. I don't like it much at all.
Like Lynn and Debbie, heat makes it so much worse for me.
And, yes, what you are feeling is really and validated. Hang in there and let us know how you are doing.