Oddly enough, sweet tea gives me awful heart burn. I was just talking about it yesterday, and liquor does too. Especially malt liquor. Hurts so bad all throughout my stomach, arms, and neck to the point where I HAVE to lay down.
It's just indigestion, you probably have a small peptic ulcer ( like I do ) that's why I think things like that cause me so much pain. I especially can't drink fountain drinks ( like from restaurants ) that's what gets me the worst as well as my dad. It's nothing to worry about, buy some over the counter Zantac 150 and Mylanta, the two work wonders for me.