Why does my hamster poop on his wheel?
In this regard, why does my hamster throw his poop?
The B12 vitamin is only produced by the hamster's small intestine, but it can only be absorbed into the body by the stomach. So that means your hammy has to bring the poop back to the stomach by eating it. That's the short version, and it sounds kind of icky. But that's what it is, and it is normal for your hamster.
Accordingly, can a hamster run too much on a wheel?
Excessive running on the wheel can cause sores and blisters on your hamster's feet. This is especially so if the wheel has metal rungs or wire mesh.
The best way to get your hamster to relax is to leave him alone for a little while. Leave him in his cage with somewhere to hide and food and water. You can talk to him softly, but don't hover over him. If you move around him, move slowly.