While I only have one kid, try adding in a full-time job to the mix, too!
I have found that I, literally, have to schedule my time; play time, work time, Etsy time, husband time, etc. Otherwise I go crazy and everyone feels ignored. It all balances out in the end.
I, too, have started getting panicked brides realizing that they need to send invitations out for their August(!) weddings. Some I can help, some I cannot. I give them a detailed explanation of the creation process so they understand that sometimes there are no corners to be cut. Most have understood and ordered anyway, some I never heard from again. It happens and you just have to keep going.