Jamie: I understand the numbness. I've been there several times. Bayoub is right. See if you can diplomatically ask your friend to take a leave. It sounds like you are plain fried out. You have been through so many emotions and physical symptoms for so long without a break. Some alone time (but no too much) may be what you need right now.
And trust me..you are a wonderful contributor to these forums. You have kept me connected even when I am not feeling well myself.
Hang in there. I am convinced that 2012 will be our year!