maybe you could bring some of the hmwk along so that you're not obligated to spend the entire week constantly socializing, doing things etc... and if it's due soon after then it's a good enough excuse to get away for a bit. hopefully it'll be nice to spend time w/ family, espec. if you havent' seen your sister for a while (am not sure)... speaking from my sister and I, I can spend a ton of time w/ her but eventually even we need a break, so I'm sure your sister will understand too. hopefully it'll all go well....

re: the food issues, can you think of anything that sounds appealing right now? go get it!!! maybe something w/ a particular flavour, or just a bunch of fruit and veggies, maybe a nice grilled sandwich, pasta... dunno, I'm just randomly listing things I can think of, lol. maybe go out for dinner w/ your sister for one night so you're kind of forced to order something. do you eat better when surrounded by people? then maybe this week will actually give you a break.. either way, you need the energy from food to keep you going but try not to focus on it 24/7.... it'll just make things worse.