Thanks all!
I had quite a lot of blood work done in early August, although this (dizziness) has happened since then. I guess I'll just see how things go. Drinking water is a good suggestion, also. I seem to require a lot, and start in the morning with a glass or 2 of water, then move onto green tea with mint.
I used to have very low blood pressure, but actually it was a tad bit high when I went for my physical in August. I maybe should have it tested again.