+1
RnR - I get that really badly. It's basically a delayed histamine reaction. In my case I think it's an allergic reaction to the pool chem. Antihistimines will work. I used to take one about 30 to 45 min before swimming. I didn't like taking meds so often so I switched to swimming with a nose plug and that takes care of it.
Swimming with a nose plug takes a little getting used to because you can't breath out through your nose. Doesn't seem like a big deal, but it will feel really weird for awhile, especially if you're from a swimming background. When you're used to timing out breaths thru the nose during things like flip turns etc. you can sometimes blow your plug off!
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2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS