What do you mean by?:
"Moods, changing on a dime, so to speak, can be symptomatic of something on top of depression. "
I have some problems with understanding what you're trying to say me. In my ears it sounds like you don't believe that I've got depression...

That I feel like that (slighted, uncared for, unloved...) Is one reason I opened this thread. The main problem is, that she (my GF) isn't doing anything but ignoring it and telling me she doesn't care... Or that she doesn't even want to care...