The cluster of symptoms and duration in your case are suggestive of a chronic condition which is having relapses and is getting progressively worse. Going by your age and history there are some conditions which could be suspected.
It is also important to know if you have any symptoms of loose motions, mucus in your stools or any bleeding. It is also important to know if you have any difficulty in swallowing and if this is present only to solids or liquids or both.
After a detailed history, examination and investigations and an endoscopy/sigmoidoscopy
and imaging could provide some more information about the condition.
Depending on the outcome of these questions and investigations, we would be in a better position to come to a conclusion.