(I already commented on neuropathic gait). About colostomy, I thought, a urinary catheter, but I see no reason why he should have it. At this moment I think it is some sort of an orthotic, there are so many produced. (But you are right, it does look like colostomy only I never saw an ostomy bag hanging at the knee level).
Steroids are a brilliant idea. Not ‘rhoid rage (as it would be testosterone), though. But - corticosteroids cause mania.
@apples12 said, depression with psychosis, it is not so far away from mania. Anyhow, the guy was probably pretty off.
Clubbing...you know, the sketch of YBG shows unusually long chin. It sometimes can indicate acromegaly - when growth hormone is released in inappropriately high levels after the body stopped growing. Then the chin, the ears, the fingers, the toes are too long. He can be hiding big hands in his pockets.