Caffeine tablets (Wake-ups) along with at least two quarts of water before hand does the trick if you don't care for coffee. And yes, absolutely lay down; although some people only need to do that for a few hours. It all seems to depend on how it goes and how you feel it seems.

Also if you do get a nasty headache...and I mean a really nasty one (you'll know it isn't a usual type), go back in for a blood patch. It only takes a few minutes, isn't painful and gets rid of the headache straight away.

Good luck and I hope everything goes easily and well for you.

With love, Erika