My new ハムスター is 芝居 strange..

Obviously something is wrong.
It shouldn't be afraid of you,maybe it's sick.
あなた should call a vet.

Well this happened to my ハムスター before i took it to the vet and the vet 発言しました it had hurt a muscle in its body and it would scream and flinch when i came close to it so that could be it.if あなた want it to stop doing that just take its ハムスター wheel out of its cage and dont let it do anything that might hurt its muscle

hope that was helpful
if not then sorry :(