I have had IBS for what seems like, and probably has been, decades. Over the past two years it has progressively become severe. All I have to do some mornings is rollover in bed; within 30 minutes of waking up my digestive process by eating breakfast; not sure I can make through an event, etc. So, I saw my Internist week for before. She did a few lab tests to rule out other possible problems. These tests: 2. Stool examinations Nothing was found via these tests. She also prescribed generic Hyoscyamine (brand Levsin) and said, "If this works for you, then yes, you have IBS." I filled the RX and found relief with the very first pill.When I saw her a few days later I asked her if I needed any further diagnostic testing and she said,"No, if the medication is working then we already know what the problem is, so seeing a specialist isn't needed."I am not sure I should be comfortable with her final assessment. I don't want to offend a good doctor, but I feel I should see a gastrointerologist for a formal diagnosis, etc.Am I over reacting or is she right?