Take a walk around the block and look at the scenery for burnout. Trust me, it works. Sometimes takes a few laps.

On overwhelm, pick something that you can do that will get something done. Doesn't matter if it's "the" right thing to do first, just get some small piece handled. Then pick another piece, and handle that. Peck away at it, one piece at a time, and don't let the chaos intrude. It's called picking a stable datum, and it works. It's based on military and emergency work principles.

If you want more details, there's a personal efficiency course I can recommend that covers these and a few other things pretty well. Takes about 2 hours, costs $50. Up to you if you're interested enough to make it worth your while. I know it's available in Orlando, but I don't know the address or schedule, but can find out both pretty easily if you want.