KT, I hope you're recovering!  I feel badly (and perhaps partially responsible?) that you're so wiped out from it.  I have similar feelings any time I'm in a big city that's not my own - pounding the pavement, figuring out where you are and where you're going, and negotiating crowds takes its toll.  You are so right about the home base thing - having an apartment to come back to that's all mine and quiet recharges me and gives me the energy to go back out there.  It is surely not an easy place to live at times. 

Next time you're here, Brooklyn over Times Square, and we'll get you a compass.  Knowing where all the public restrooms are helps too.  I'm just a text message away :)