This forum has really helped me. Don, I really do beleive that all things heal with love. That's my higher power. I also look at all those I love around me and think of how lucky I am. You mentioned that your mother is sick. To be sad about that is a very normal response. That is what compassion is all about. We hate to see our loved ones suffer, and of course, we hate to lose them. Don't think about what could be, but cherish the time you have with her. You can't control the fighting between your wife and daughter. All you can do is take care of yourself and be a form of support for your family.
When I get down, I turn to my kitties and my hubby. I also will choose to pull myself out of it and go running or pour my energy into art. It also helps to vocalize what is bothering you. It "gets it off your chest" so to speak.
All the best to you...