I have huge sympathy for you, bednobs, and for mr B who doesn't know where he's going. I don't know how you do it - you know him so much better than we do - but he needs to come to terms with the fact that this isn't a macho man thing to be ridden out, he needs to get some help. I heard a lecture recently about how we need to express things in different terms to blokes - whereas women think of consequences, men often benefit from terminology such as "taking control of this situation", "being in charge". If you can persuade him this way, that the answer is in his hands but he needs to ask for help, that would be such a step forward. After all that you have both been through, it's certainly not going to be seen by any GP or nurse as admission of not being able to cope (which bothers some blokes) - more that he's recognised for himself that things are not right and he's made the decision to ask for support. The GP won't think he's stupid, even if Mr B can't explain it very well.
The move is no doubt not helping - that's a stressful time in itself...... it would be good if he could be persuaded to defer the sale until he's feeling stronger in himself, and better able to take charge of the move.
Thinking of you both ♥