I can really relate to what you describe. I feel like I've lost my short-term memory over the past four to six weeks as my anxiety and depression seemed to get worse. One of my triggers, I think, was that I was just promoted. And, as a response, my mind shut off!! Positive life events can be just as stressful and catalytic as negative ones. It seems to be about the intensity, or at least that's how I see it.
Losing my memory and common sense makes me feel like I'm deteroriating, or like my whole life before was a lie....I feel so stooopid! All I want to do are repetitive tasks, if I want to do anything at all.
I also have a hard time feeling emotion right now. I think I'm simply exhausted and too scared. My therapist said that I should take time to relax and rest, even if it means curling up in a blanket. And I just started medications this week.
It sounds like you've had some great accomplishments and that you're going through a lot of change. I second everyone else's advice to talk to a dr. about what's been going on in your life. It's really painful to be isolated. You don't deserve that. Nobody does.
And congratulations on your graduation!