Hi Vicky,
Those are very very common... and symptoms increasing when you're at at the store... or in open spaces is also comon and medically explainable. In open spaces with high stimulation, our brains have less relative data to create balance. When we are near walls... etc.. the brain uses those to "ping" of for balance. When in wide open spaces with visual challenges, it makes it harder. (Same reason it's harder to close your eyes and stay balanced.) The good news is that it's harmless.
The boaty symptom you describe... is also very common for PPDS.
Here is a great thread about PPDS:
http://www.tmswiki.org/forum/threads...ome-ppds.4599/
TMS is a condition much like anxiety, mentally based... and involves the body creating symptoms to distract us from mental pain/fear, etc. It's basically just another way to frame anxiety disorder.
I highly suggest people who are reading this read about PPDS, psyghogenic dizziness, etc.