oohhh a roast sounds good, cat! I found that the first week or so I was famished. Enjoy indulging yourself in some comfort food - it not only helps replenish nutrients, but helps with the cravings (when our blood sugar drops, we interpret it as needing a drink). You're going to start to feel a whole lot better in another day or two.
Also, I'm sure you've read other posts here, but the B vitamins are really essential right now, so make sure you get a bunch of them!
Hang in there - you're doing great!!!