I'm sorry to hear you're going through this. Do you have anyone you can talk to (in real life), like a friend or parent? I think it might be a good idea to go to a doctor, too. Even if it's just that he's going to reassure you and explain how/why you're feeling like this (if he knows!). But if you have been depressed before it's good if you have someone around you looking out for you, so they can tell you when they think you're getting ill or something.

Just want to add that if you're not eating properly it affects your memory. I eat badly on and off, and have began eating badly lately and the difference in my memory is crazy, I'm having to try really hard to remember things the day before... things like that. So your memory loss could be party because of that. And also maybe... stress?