He should take regular medicine for diabetes
There is nothing much to worry about. The symptoms are related to dehydration
that may be due to colitis or he should check his blood sugar levels that may be decreased as he is taking medicines for Diabetes. If the diet is decreased there may be a decrease in the blood sugar levels that can cause decrease in energy supply to the brain and that results in confusion and disorientation
Pain in the leg
and shoulder is related to lying on bed for long period of time that results in muscle stifness.
There is nothing to worry he should have a good diabetic diet and plenty of fluids to correct for the dehydration.
I hope I am sucessful in solving your query If u have further you can ask me
Dr. Azhar Sattar