I don't mean to make light of your situation but think of the extra time and the room to indulge your quilting passion. I'm lucky that I live in such a sunny place so don't suffer that SAD syndrome. Maybe start stock piling some quilts to donate to a worthy cause. I always find doing for others makes me feel great even though I'm an upbeat person.(DH says I'm ridiculously happy) I went back to work when my youngest was in high school so was working for myself by the time they all left. I wasn't a quilter then but did sew and loved growing plants.
BFF and I would go window shopping and have lunch once a week and would go to craft or flea market every weekend. Sometimes we'd buy sometimes just look. It got us out and talking to other people.
I hope you are feeling better real soon and send you a BIG hug.