I came here to ask the same thing. I'll probably request a refund if there's no way to disable it.

There is no way to disable it, sorry

I haven't started the game yet but if the head bobbing is really bad then I too will ask for a refund.

Developers need to stop putting crappy visual effect that cannot be disabled. This thing makes me instantly nauseous. And I cannot be refunded because I bought it two months ago.