Gastric again

Do I have problem with gastric or coffee? Shared a cup of coffee (from Arts Canteen) with Serene after lunch and I ended up with gastric an hour later! I guess the coffee is too acidic. Probably I should just stick with espresso or any ice blended drinks from StarBucks or CoffeeBean.

No coffee for me from Arts Canteen. :(. Guess I can only grab coke from there from now on.