Watch his litter habits closely. Make sure he is able to pee. If he is not peeing, then yes you need take him before Monday to be seen.
Really nasty breath is many times from dental problems, but there are more serious conditions that can cause it such as lung disease and kidney disease.
So this is something you need to get checked out this week.
If he is using the bathroom ok, then you can wait until Monday. If not, then take him tomorrow. Make sure he stays hydrated and nourished as you seem to be doing.
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