I feel for you John.
Good ideas here. Might be too cold to go outside, but it does help. Maybe time to try a warmer climate. Arizona, Florida, maybe on the Gulf.
Maybe some volunteer work, being around people doing good things helping others.
It's been a rough year I know. And I know you miss your mom. It just takes time, one foot in front of the next. Keep trying different things, meditate, support groups...whatever it takes to help you make it through the dark time.