I lose weight when I'm stressed, too.

My first year of grad school I went from 108 to 92 lbs. I was only getting 5 hrs of sleep a night and had to eat constantly to get through each day. A few of my classmates were gaining weight at the same time I was losing. Everyone's different. I'm pretty sure I was eating more than "normal," too . . . to my normal, healthy diet I added more yogurt, more fruit, nutella and crackers, donuts, oatmeal, instant soup, and I drank pop for the first time in 10 years . . . it actually took me a couple of years to put the muscle back on after that period of my life was over.

Sounds like you're going through a big transition . . . as someone else said it's probably a good idea to check in with your doctor . . . do what you need to do to get through this tough time, and when you're ready start taking steps to reintroduce activities/habits that are "normal" to you, or find a "new normal."

Take good care of yourself