You can pm anyone by clicking on the 'message poster' link on the blue bar above one of their posts. Thanks for offering to chat privately; there are things that I wouldn't post on here because it would feel disloyal, so I will take you up on that offer if I feel I need to offload. Feel free to do the same 
DP was working as a postman [hollow laugh] up until June last year when he went sick. He would be out delivering for up to 3 or 4 hours longer than his colleagues and still not get his job finished on some days. He used to come in and collapse on the sofa, get into bed with all his clothes on, fall asleep in the bath etc, as he was just soooo tired.
Royal Mail were excellent when he went sick though. The company doctor recommended he be retired with immediate pension without us having to fight. It was a relief, but kind of bitter sweet too. He knew he couldn't carry on working but to him it felt like major rejection. His employers were so happy to get rid of him that they pay him every month to stay away!
As for future work, DP is hoping he can do the Knowledge of London and become a black cab driver. I don't think he would pass the medical but it's worth hoping for.
I've just told him that I'm chatting to a woman who's partner is in the same position as him and he is quizzing me about how he's coping. Would you mind telling me which joints are affected in your DP. My DP is desperate to know
(and apologies for nosiness).
I think a support group would be great for DP as he really needs to speak to people who understand. Do you know of any good ones?