I too had terrible heartburn after having my gallbladder removed. I started with the 2 tbsp of ACV in 16 oz of water and sipping throughout the day. It was better but the I noticed that EC recommended 2 tsp so I switched and got much better results. I used to take 3-4 (minimum) Tums a day after getting off Prilosec and Zantac. Now I never take any.
I recommend anyone with heartburn to keep ACV with cloves of garlic in the refrigerator and drink an ounce of that mixture next time it occurs. The results is almost immediate.
I used to get severe heartburn after eating spicy things. Last year a friend recommended me to drink a tablespoon of apple cider vinegar. In less than a minute the burning sensations were gone. Ever since that I have never had any burning sensations. I used to take tums and rolaids or drink milk and it would not provide fast relief.
I used to suffer from heartburn after every meal. Even after breakfast! After stumbling on ACV, I have not suffered from heartburn ever since. It has cured my sinus headaches and also a wart that I had on my finger for 5 years! ACV is better than the doctor. I don't drink ACV but rather eat about 5 tbls. of it on a cabbage salad recipe. I eat it every day.