I joined a gym too. So far, all I've really used is their treadmills. I just walk slowly on it, and make sure I hold onto the handrails.
I'm not sure I want to try to use their swimming pool, but I think that's just because I dont like my swimsuit and dont like it when people see me in my swimsuit. (cant find a new one that I like either) I may look at their pool tonight when I go treadmilling with my dad for a half hour. The lady that got me signed up at the gym told me their water is 84 degrees. I'm just not sure if that's too warm a temperature for me, or too cold a temperature.
Next time I have vertigo problems, I might try the swimming pool instead of exercising on the treadmill tho. At least if I fall down in a pool, I probably wont hurt myself.