It was about 8 years ago when I used to go to the swimming pool in my area. It only lasted about 3 months. I was ok, I didn't do much and was never in the pool long. What stopped me from going was that I got this burning blister on my chest, a couple of inches below my collarbone. It was a strange thing and took a while to go down. I wondered at the time whether it might have been a chemical burn from the pool. It put me off going again. Although, probably unrelated to the pool.
If it was an indoor heated pool that you went to, there would be a lot more moisture in the air and perhaps that may have affected you and breathing in the chemical vapour from the pool?
Hope you feel better soon.