I can relate to your situation in many ways. I lost an exhusband (the father of my children), my Mother and then my oldest daughter in a span of three years. Fortunately I have a wonderful husband still with me....
I went through a long period of depression. It would lift for a while then come over me like a shroud. It was such a bad feeling.
For me this quilting board, humor and forcing myself to get back to sewing and quilting , finally helped clear away the sadness.
When you look around at what's going on in the world, the unrest, the rising prices and unemployment, it's easy to feel hopeless and depressed.
Humor has always been a saving grace for me. Watching funny movies and reading funny books can help. For me, having my youngest grandchildren move closer really helped a lot too.
It's different for everyone, but somehow reaching outside your self to others really helps. I hope you find a way to see there is still a worthwhile life for you....Stay strong, spring WILL come! :D