You have us, your internet family.
Things can get better, but only if you let them be. I'm sure you can walk, so go outside, go stroll the mall, do some shopping, sit at a Starbucks/Barnes&Noble and read. Strike up a conversation with a stranger, casually try to find out as much about them as you can without diving into any of your on going issues. Keep the conversation light.
Buy a dog, or rescue a dog from the pound and show it the love you wish to share with the world. Nurture it, make a new best friend. Take it for walks, and to the park and meet other dog owners.
There is a whole world out there, so sitting in your house feeling sorry for yourself day in and day out is not going to let you enjoy the rest of your life, which is exactly what I'm sure your recently passed loved one would want you to do.
So go take a shower, shave, put on a nice fit, and go out and do something that interest you.
There has to be something that you've been meaning to do or go see since forever and never got around to.
Sign up for some classes or workshops. Big Brother program. Try some volunteer work. anything that gets your mind off everything that is currently on your mind. You need to get out of your own head for a little while each day.