My stomach is harder on the left side under my ribs than on the right. if i strech my muscles it's the same, but without stretching it's different. i sometimes feel a discomfort on this side, a doctor said it's likely ibs.is the difference a problem?

It is not feasible to provide an opinion without additional history, physical examination may be some tests. It would be prudent to see your doctor to see if you may be depressed. Depression is treatable. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!