I've been where you are, Roy, particularly when I've suffered episodes of major depression. I lost interest and pleasure in virtually all activities. And, like many others, I confused "doing things" with getting involved in living my life.
I may be wrong, but I get the sense from your comments that you may be somewhat isolated; you didn't mention that other people, family and friends, are either trying to help you through all this or supporting you. I needed to break my isolating behaviors in order to get back to living, to allow people to help and support me. It sounds so very simple, but I know how difficult this can be.
You only need to open the door a little bit to let life in again. It doesn't hurt nearly as much as we may imagine it will be when we reach out for help.