I don't think you lost too much weight. Stress is a funny thing some gain weight and some lose weight. Like you I lost 30lbs on the impending divorce diet. (Not recommended) though.
Okay your sad on Friday because you don't work the weekend and you don't have work to distract you. Weekends probably were family time and you miss it. You need a hobby or constructive activity, that might help alot.
I would agree with you about the weight, there's only one problem. I'm 6'5"-200# on 6'5" looks rather skinny. And I'm getting comments about NOT losing any more weight.
I have hobby, I play golf. I'm playing on Sunday. Maybe your right about Friday's..Maybe in the deep dark recesses of my brain..I dread the weekend??