No one can for sure diagnose your rabbit over the internet. From the symptoms you described, especially the not eating, I would get the rabbit into a vet as soon as you can. Not eating for 12 hours or more is considered a medical emergency in a rabbit.
This is just a guess, but he may have an ear infection. It can cause head tilt and loss of balance. If it is an ear infection, your bunny will most likely need antibiotics and possible meds to manage his dizziness and pain. If he does have an ear issue, the longer you let it go without treatment the worse it will get, and the harder it will be to treat in the long run. Please get him into a vet to see if they can figure out what's going on.
Good luck! I hope your rabbit is ok. Keep us updated.
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