Glad to hear that. You know, on the subject of caffeine, it doesn't generally bother me if it's in soda. I've never been a tea drinker and cut out coffee long ago because it just didn't agree with my stomach, so I'm not sure if there's a difference. Looks like caffeine would be caffeine to me no matter what it's in. But there's other stuff in these drinks...
So are your chest pains gone? I agree that it was probably gas. In fact that was almost definitely it since you felt better after you burped. I gather that this isn't uncommon. With my anxiety, most of the time I will get some stomach gas that causes me to be nauseated until I finally start burping. It can get pretty bad...my belly swells up like I'm pregnant. Not a good look for a guy. Anyway if you ever have trouble with this again try some anti-gas meds. You can find this over the counter in pharmacies and groceries. They help by forcing the gas bubbles to coalesce so that they are easier to expel. At least you weren't farting all the time! I suppose it could go that way, too.
I haven't been doing it lately but exercise can also help. If you play ball you're probably getting plenty during the season, but as the winter comes just make sure you get up and walk around every now and then while gaming. Three hours is still a pretty long time to sit still, for sure.
Always good to meet another baseball fan, too. I hope your favorite team's going to be playing in October. Mine blew their shot but will be back next year!