
I don't think that he is not eating because you put the tablets in his food. Is he taking the tablets now? It is important he gets these and they don't get lost in his food. The nature diet may be a little heavy if he is feeling poorly, try scrambled eggs or roast chicken, don't know why but they prefer it roasted (no oil). Hand feed it in tiny pieces until he feels a little better.
Can't help with the flakey nose I'm afraid, perhaps someone else can, what ever you put on it will probably be licked off anyway.
Good luck
Sandra