My horses got their vaccines last night and one of them is having some sort of reaction. He ate all his hay overnight, normal manure and drinking, and this morning he ate his grain and hay and drank normally, but he's very unhappy. His normal personality is totally subdued and he stands with his head at wither height, and paws at the ground once in a while. He seems to be able to move his head down to eat without issues but was reluctant to put it over his stall door like he normally does to get a treat (though he was interested in the treat so his appetite seems normal). It seems to take him a great effort to swing his head around to shoo flies off his sides. I called my vet and he said this sort of reaction is normal and as long as he keeps eating/drinking/pooping he should be recover in a day or so. But I'm a worrier and am wondering if there's anything I can do to or if it's just a "wait it out" thing. Banamine maybe or is that overkill? I try to avoid giving painkillers and don't have any on hand but could go buy some easily enough.