Karen,
apart from getting some sleep, you will have to make some decisions. I'm not a great customer of yours, so perhaps I have no right to speak, but if I were in your shoes, this it what I would do:
1. Get rid of the ranges that don't sell well and/or don't interest you that much (Snoopy, Marsupilami, whatever, that's your call). Be more focused on your specialities until you have the possibility of spending more time on the shop or getting any help (and I know both those chances are very slim).
2. Lots of your time go in the paperwork, the shipping and handling, ... : if someone only buys one normal smurf, the effort isn't worth the (direct) result. It's good to have a good reputation and the customer is king, but you have to set some limits. You could put a minimum price for every buy, or raise the shipping / handling cost when someone stays below a certain amount. That way, you will probably lose some customers or transactions, but those that are left will be more worthwhile (financially).
Just my $0.02