Help!

I think Jorge may have broken his back or butt. Do fish have butts? This fish has scared me several times making me think he is dying, but this time I think its for real. He hasn't eaten in weeks. This is all he does all day. He used to lay perpendicular to the rocks, but now he is just vertical like this all day.



I am having this dilemma b/c I am afraid he is suffering and I need to euthanize him (flush him), but then again, I don't want to murder him. Having a fish can be much more stressful than one thought.