Simethicone is a human drug and can be purchased at any pharmacy without prescription. We generally use the infant baby drops known as Mylicon (there is a much cheaper generic version under different brand names). But I don't think I would use it unless there is a need as this only adds to the stress of the situation. As I mentioned, we insist on narcotics post-op and all of our spays/neuters are eating quickly. We do offer a "buffet" of any bunny safe food to encourage eating. My vets are all quick to pull the trigger on narcotics and over the years I have seen the benefit of managing pain aggressively.
If she is hunkered down a bit, that is a pain presentation. It might be comforting to add a little heat.....a heating pad on lowest setting and let her "lounge" on it. Of course, don't let her sit directly on the pad.....we usually cover the heating pad with a towel and put the animal in a kennel cab. If you use this, monitor her often as the pad can get quite hot and burn even on the lowest setting. We usually have the kennel cab only partially on the heat so the animal can move away if they want to.
And I am really concerned about the having to get the run around to get Metacam. This calls into question the rabbit savvy of this vet. And since I have some surgical experience, I have a standing offer to any vet that refuses appropriate pain meds post op that I will spay or neuter them and offer them only Tylenol.....and I will travel and perform the procedure for free. I have had no takers so far. But seriously, if a vet truly understands Rabbit 101....he/she should know the negative effects (especially in the gut) of pain and every effort should be implemented to control that pain. I
A couple of notes about Buprenex, if they will give it to you.....it can slow the gut just a bit (like many pain meds) but this is a case of the lesser of the evils and it's more important to control the pain. Buprenex can be administered orally or by SQ or IV injection. Given orally, it does not have to be swallowed but is absorbed in the membranes of the mouth. Buprenex works for up to 12 hours. Some vets will give Butorphenol (Torbugesic) and it is an excellent analgesic but doesn't last long at all in a rabbit. And if you can't get Buprenex, as I mentioned, Tramadol is an acceptable alternative.
Randy