Strange sensation

[Bigfatdog]

Yesterday I did like I've been doing for a couple of weeks. I had my 2 cups of coffee and took a lasix and started my first glass of cranberry juice. After a few minutes and several trips to the smallest room in the house -- I got dizzy and light headed and kind of felt like I was floating. I ate 2 peanut butter and jelly sandwhiches (the quickest thing I could get my hands on) and drank a quart of water. After that everything was fine and I went back to cooking breakfast.

What do you think my problem might have been? Low blood sugar or low potassium? Opine for me if you will and thanks.