Lightheadedness upper right and left quadrant irritation.. what is causing it? For about a month and a half I have been lightheaded nearly 24/7. The doctor gave me something for sinus. Still I am lightheaed round the clock, and now I am starting to get some irritation in my upper left and upper right quadrant. I recently had a stress test and echo, so I know it is not a heart problem. I had blood work a year ago and everything showed up fine. Any suggestions? Last time I went through this I found out I had lactose intolerance. I have been going through alot of dental work in the past year, and do not have a stressful life. What could be causing this? Any advice would be helpful.

Summarized question: What is causing lightheadedness in the upper right and left quadrant irritation?