This is a question you need to address if you have fibromyalgia and/or IBS. I had always thought I had too much stomach acid since I felt a lot of burning in my stomach and had gastric ulcers several times. My GI specialist also assumed I had too much stomach acid and prescribed antacids and later when they didn't work PPIs (PROTONIX). These relieved the symptoms quickly but because they did not address the real problem became ineffective soon afterward so that I had to keep taking more and more of them. My natropath finally recognised the REAL problem as TOO LITTLE ACID in my stomach...a condition which is very common as we age or when we are under stress or are prone to worrying all of which I am. Well, to make a very long story short..I now take HCL + Pepsin with my meals where I consume protien or carbs and I have NO IBS, muscle pain, stomach pain to speak of. AND the best thing of all is that after 18 years of INSOMNIA, I now can slepp almost through the night.....each night my sleep is improving.....I had no idea HCL was such an important acid in our systems. TOO little and too much acid have all the same symptoms so one really needs to rule out too little acid by conducting a controlled test with it. Just take a tablet with your meal and see what happens.