I'm with you all on this too and I hate it as I've never been a moody person. However, I think I'm learning to grasp onto the good times and I'm hoping - and I've read as much - that eventually the good times do outweigh the bad.
My and my WH have had a few really, really bad days - I even told him I wish I'd never met him to which I thought he was going to have a heart attack it hurt him so badly - but then yesterday he was asking me about something completely non A related and I could see the torment in his eyes and unsureness(?) about asking and I had to laugh and tell him it was ok, I understood that he must feel he's walking on eggshells with me!
It's probably good - and I'm not in any position to be an expert (DDay 3rd Jan 2013) - to try to remember the good bits? Hang on to them in the darkest times.
I just now need to read my own advice and try to act on it!!