Well, vacation over a weekend (3 days?) not really that brutal. If you do the WC before you leave for vacation then it should be fine WITHOUT your buddy fish babysister...It's must be something wrong on your end, for future just leave your tank alone, i'm pretty sure none of your fish will die without food for few days. I'm not here trying to convince you stay in hobby, if you really want to leave then NO ONE could make you stay so pointless for me to make you feel better over the issue! Get over it and move on or quit if you think that's your life breaking point...