If you are not on anything for it at the moment apart from over the counter stuff, I would strongly suggest going to the Dr. because it COULD be something else. Even the Emergency Departments have to run tests to rule other things (lifethreatening) out. If it is Reflux, and left untreated with the appropriate treatment it can have some very serious consequences - even leading to Cancer.
The fact that you get this problem while doing that kind of exercise concerns me (I'm coming from a health background), because it COULD be exercise induced Angina. A lot of people treat themselves only to find out to their detriment that it was infact Angina, but they have found out after a Heart Attack.
My Stepfather was one of those. For years he swallowed Gaviscon fairly often, and said it helped. He found out after he effectively died that it was in fact Angina. (The Paramedics/Drs used a defibrilator 7 times on him - a lot more than they normally would!) He hasn't had "Reflux" at all since he has been on Heart meds.
Let us know how you get on.
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