Since when hasn't he been eating? Is he drinking water? Has he swallowed paper from the phone book? Has he pooped or peed at all? In the affirmative how are his poops? Normal or smaller than usual?
Try giving him A LOT of water and hay. Hay will restore the intestinal contractions. If he's not drinking he will get dehydrated, which will make things worse, so, in this case, you should buy Pedialyte from a drug store and give it to him, it will hydrate him and substitute the electrolytes he has lost, if he hasn't been drinking. Try also canned pumpkin (NOT the sweet one), there is fibre in it, which will keep the intestines moving and it's taste is pleasant for most of the bunnies.
Does he lie down in a hunched posture? Are his eyes half closed? Do you hear his teeth clenching? All of the above are signs that he's in pain. If so, Metacam can help alleviate the pain, which, if left untreated, will cause a vicious circle, since the more they are in pain, the more they don't want to eat. Does he stretch and press his belly against the floor? This would mean gas. Infacol (an off the counter white syrup for infant colic) would help with gas. Moving him around and gently massaging his tummy would also help.
How is his temperature? Feel his ears. Are they cold? Are they hot? If he's cold, wrap him up in a towel and keep a heater by him. Fast breathing could mean he is in pain, but could also be a sign of other respiratory problems or a heart condition.
If you could answer the above and be more specific about the problem, we could be more precise in helping you out.
Marietta
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