Hello, I have been experiencing some rumbling(very loud) in the left side of my abdomen and its always the same side, it can cause pain, almost as if its bubbling in there, I can actually feel it when i put my hand on it.. I had been given a prescription off a doctor in 2012 for an acid problem i never knew i had, but never finished the course which was 4 weeks, 1 each day. i cannot remember the name, but i was wondering if this is a acid problem and if i should see a doctor about this, i suffer from heartburn almost everyday, especially at night.