Fired AGAIN

I had posted in another thread a few weeks ago that my DH had had a couple job interviews. He got a dream of a job - perfect hours, very nice commute, and really great pay. He has been out of work for more than two years so this was welcome. 

Yesterday he came home early. He had been fired for doing something - he wasn't clear on the details, but he's been fired several times for similar issues (lack of planning and following through, focusing on one small thing and letting really big things fester). 

So now we're back to square one, yet again. He said he's just going to "see what happens" and is not planning anything. He doesn't do anything all day; just sits on the computer, while telling me every evening that he's working on organizing the bottom half of the house that is filled with his stuff. 

I asked him to get medical help but he gets offended. He just has zero concerns of how this behavior - spanning the last 22 years - has affected our family. 

Not sure where to go from here.