Many thanks to everybody who has responded. It's helps to know there are people out there who understand the situation. DP now signed off for four more weeks! His work will try and find him less pressured role. He is not drinking at the moment so the mood swings seem less. He is going to try and get some counselling via work which may help. He seems quite bright this week but the nasty part of me thinks he just likes the idea of 4 more weeks off work! ( He is quite lazy generally). He did seem somewhat confused at the weekend but I think he was not drinking enough water. When I mentioned the confusion he rushed off to Google early onset dementia!
My thoughts are with all of you who are going through this or have had to deal with depression in the past . Thanks again for your support.
NHS U turn on trans terminology