How do you not get overwhelmed when you create a product?

We're launching here tomorrow, but it's seemed like whatever we do is not enough. We try to be clever on Twitter and engaging on Facebook, yet when it feels like when we are starting to get a handle on things, there is something else we're missing and we begin to feel burnt out from the constant need to do more... Has anyone else found this? Or have any suggestions that might make this easier, mentally or physically? Thanks! (From someone who hasn't had enough caffeine yet this morning!XD)