Welcome Penmarny
Heidi is correct from where I'm sitting, although I don't like to point the finger at diabetes, a lot of people suffer from depression regardless of added conditions, but yes a lot of us can be moody and depressed! If you need any other help just ask there will be plenty of peeps happy to help with there own opinions and life experiences! I have been offered council/therapy/a chat by my diabetes specialist nurse (dsn) if I need it, maybe it's something to consider? Although I'm sure it would be difficult for some to admit it would help, me included, I think I'd hit the bottle first, and second!
Take care
Rossi