Lately I have been getting dizzy spells after light activity or walking, I have a lot of health problems, one is fluid build up in my legs and abdomin. I have diabetic syrosis. I have had to up my lasix to rid me of the fluid, and at times after a brief walk I get winded and dizzy. A few days ago I amost passed out. And my chest feels like its heavy with fluid. no pain like a heart attack, I've had 4 of those. Could low Potassium be my problem?