You are not going to solve all the issues facing you tonight.
Yes, there is a lot on your plate. That stopped being funny a while ago, didn't it? But you are an intelligent, hardworking, capable person. You will finish your thesis, you will get a job, and you will move to D.C. You will get to see Jim next week. You will have a wonderful Christmas with your family. About that - your weight will not balloon. It hasn't these past few weeks, has it? You're fine.
One thing at a time. Remember everyone you have in your corner. Remember everything you've gained and all you have to offer. People like you because you are worth liking.
Now go enjoy some wine and cheese with your sisters. And watch a movie.