You feel you've done everything. Why do you think that your "husband is not committed to making changes ?". Is it because you are trying to elicit change ? Maybe because he is depressed is a simpler answer.
It's a bit facetious to remark that this is "The million dollar question..." (Kip). Making fun of someone's suffering is not very empathetic. It's just one question in a complicated scenario and even friends that have offered work hadn't had much success. Why would this be so hard to understand ? The guy has lost his job, suffers from "depression and anxiety", doesn't seem able to change, comes from a dysfunctional family, has lost his passion, his sporting hobbies, his motivation for living, hasn't worked for a year and doesn't seem keen to seek help. A million dollar answer would be more therapeutic.
If he went to the couples counselling (unhappily) then why not try another session or two ? This might encourage him to seek talking therapy on his own. The main thing is that he did come along. That seems a huge plus compared to the other factors. There might be no reason for his depression - it might just be a bunch of defense mechanisms or emotional turmoil he's going through. A man that is not able to work for his family is very hard on himself. Why make it harder by making him accountable or by comparing the great first years with now ? Marriage is marriage, for good or bad.
I hope that was more helpful than the glib "The million dollar question..." response by Kip. When I respond I am using years of experience as a depressed husband that has battled this disease and managed to still have a family and a career. I would never make a put down like that. It's missing the point. Touche. There are other responders on the site that can honour your thread with a bit more understanding. Being depressed is not a choice; being supportive is. And you seem to be doing a great job with this predictable illness.