Itching

Lately I have been having trouble with severe itching while pool swimming. Not the kind that feels good when you scratch it; but an intense, pins and needles, maddening, burning sensation that forces me to stop at least every length to scratch-which doesn't even relieve it-just hurts enough to get to me to the other side of the pool. This used to occur years ago off and on at my old pool. It almost never occurred at my current pool, but has been happening every time the last few weeks! There is no rash, and it goes away after showering. I haven't talked to any pool staff because I am afraid they would just say they don't know, they're not doing anything different...and I would just get really mad. If I could be armed with ideas concerning anything from PH, chlorine vs bromine, algaecides, different brands...I may have a better discussion. The fact that it doesn't occur all the time and I am really not sensitive to much of anything makes me wonder if there is something different being done...