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From your query it appear that you have multiple symptoms of irritable bowel syndrome
(IBS). IBS is very common in anxiety disorders specially in presence of normal investigations.
Person used to develop similar symptoms in exam stress. Excessive fatigue can occur in stress and anxiety due to muscle spasm.
It is better that you are already on some treatment. Untreated case may lead to severe and depression
too with social dysfunction
Apart from that psychiatrist
help, aerobic exercise
, healthy diet and supportive counseling will help you.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal