If you are at all worried why don't you give the vet a ring? Perhaps they could come and give him the antibitoic and painkiller by injection?
As you said I wouldn't worry about him not eating but he may get dehyrdrated if he doesn't drink.
Re the tramadol painkiller I take this and, not sure whether it would have the same effect on an animal, but it makes me feel quite sick if I take it for more than two days.
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