Drolefille, you have my deepest and most sincere sympathies. I'm also moving this week. Only I'm taking all of my things from my mother's house (plus sentimental items) and moving into my small house. I've been moving a lot of awkward items for months, but am just boxing the heavy stuff for the movers.
I packed a suitcase, just as if I'm going on vacation, with the items I'll need this week (well, past two weeks), and am living out of that. It's streamlined quite a bit.
U-Haul will buy back any unused boxes, if you need any. They have good instructions, which I immediately lost
and this is very stressful for me. While I've moved 17 times in my life, this is the first time it will be, "that which I don't take now, I will never see again," and it's freaking me out.
As for the food, I haven't bought anything "exciting" in the last month, and that which I don't take will go to the food bank. We're having an estate sale, so I'm not so sure about the clothing - but the way my mother dressed, it will probably go to the estate sale or to a consignment shop. There are major designer clothes that she never wore. I haven't even gotten into the two attics yet!
So, come cry on my shoulder. Maybe we can both get through this together!