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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
Relafen is a non-steroidal anti-inflammatory medication that can cause stomach problems too. There are many different anti-inflammatory medication on the market and you just have to be careful on the one you take and hoepfully find one that works for you. A lot of people like Celebrex which works like Vioxx and Bextra.