Wait till Tithers posts...you'll see lots of interesting information. She's not shy about posting or asking questions of a personal nature. That being said, if you can't ask it here.... the only other place you might want to try asking is your sister or mom if that's possible. I can ask my sister ANYTHING.....she's had 3 babies, one of them @ home in the basement in a tub of water. Nothin' fazes her.
Anyway....
To your question. You should NOT be getting burning from swimming (unless you get a shot of water up your nose....THEN, you'll get burning...but that's different.).
I asked my gyno about that issue once, because I kept thinking I was having recurrent yeast infections. BLECH! She said that as we age, things tend to get a bit drier. That will sometimes cause itchiness and burning. If it's totally external, then you might be able to treat it with some OTC hydrocortisone ointment. Not, cream she said, because it doesn't stay as well. I got a generic drug store brand and it's lasted me awhile. She said that she has patients who use a pea-sized amount of it (she recommended the 10% variety) after every time they workout. I was a bit skeptical at first, but went ahead and tried it out. It will generally clear up "discomfort" overnight, or at the most one night and a day.
However,
if you try that, and it doesn't seem to be working after a day or two,
get thee to your doctor! If you end up going to the doc, be sure to let him/her know what you're doing when you notice the problem. Sometimes, they can make different recommendations depending on your activity level.
Also, just because your pool is affiliated with your hospital, don't assume that the people taking care of it are keeping it up properly. You may want to ask to have the chemicals checked to be sure that they are at proper levels.
Be sure you're really rinsing well after you swim, and my sister would recommend that you "go commando" as much as possible. But, she's really an earth nugget nature mom.
Stitch