I feel for you, sinking. It sounds like you need to do something about your isolation and idleness. Hanging around the house with nothing to do is a recipe for insanity. I know because that is my situation a lot of the time. I try to get out, bring my laptop to a coffee house just to be around other people. I am starting to reach out to friends for coffee dates. I have hooked up with a meditation community and am meeting people there, taking classes and volunteering. I hope you can find something that will engage you and help get you out of your head.