Re: Diagnosed with IBS by my GP.
Yes it sounds typical of IBS. I have it myself and have your symptoms and more eg )Diarrhea/Constipation.
Also if you have been under stress it will not help your symptoms.
All the blood tests you have had have showed clear, if there was any doubt your Dr would have investigated further.
I was given (Mebeverine & Domperidone) for my IBS and found it helpful.
Hope you soon feel better,