@simrin-- Over-the-counter anti-acids are basically useless in my opinion. Try aloe vera juice instead. It can be found in natural food stores, it's very good for the stomach.
You also need to drink more water to "clean" your throat often from the acid. For sore throat, suck on natural candies with honey. Ginger candy is also very good. It treats both sore throat and upset stomach. In fact, I was doing a holistic treatment for a while with ginger powder and honey for acid reflux. I used to mix the two and take it first thing every morning.