Just wanted to say hang in there and be gentle on yourself.
This is a crazy time for you - so much going on, so many emotions, and then top it off w/ a nice dose of exhaustion. I so understand. What you are feeling is normal.
I think anyone would be tempted to eat for comfort!
Just do the best you can to eat as healthful as you can right now. Your body is really going to need all the good nutrients you can give it, even though you may feel like mainlining sugar & carbs is the way to go. : )
Cut yourself some slack...when you have time, go to the store to purchase (or have delivered) some nutritious food. Make sure you get in those fruits & veggies. Now is not the time for elaborate meals (unless you like to cook to relax).
Save that extra time to get some rest for you or be w/ the hubby.
The journaling is great - even if you just type out some stuff and save it as a "work in progress" document. For me, I wouldn't even bother tracking (one less thing to do) but for others, that might be just the ticket to feel more in control in an out-of-control atmosphere.
See what works for you.
Try to get some sleep....a nice walk here and there, etc. Maybe someone can sit at home while a friend takes you out for coffee - just to get out of the house.
You have to take care of the caregiver (you!).
Good luck and hope hubby is doing better. Hang in there!