These are very good points. I have been trying to remind myself that, even if it was the wrong decision to come to Yale, it may or may not be wrong to stay. Perhaps Yale isn't the place for me, and staying will continue to make me unhappy. But perhaps I've adjusted just enough to make staying the right decision--perhaps my net happiness over the next five years will be greater if I stay where I am. Ultimately I think that whatever I decide has to be something I'm comfortable deciding; I think part of the reason I've been so unhappy here was that I was so unsure of my decision to come. Maybe if I feel like I've made a solid decision, to stay OR to go, I'll feel happier.