This Sunday times article talks about how an end of a job due to redundancy or forced resignation (perhaps retirement too?), can be like the end of a relationship. There needs to be time to grieve however, unlike a relationship often finical issues mean can not have a break.
One of the tips in the article is to switch industries so not, constantly comparing old and new job. Per my earlier post, it can be a good time for a sabbatical.
It also talks about not letting work define you by finding things to increase self worth outside of work. I know losing a job, you have put heart and soul into can be detrimental to self worth.