Week off?

OK. my girlfriend of more than a year told me that she needed a week off from our relationship. For several years I've been suffering from bouts of depression that can last anywhere from a couple days to several weeks and it has seriously hurt our relationship. I love her more than anything, but I can see how my sadness brings her down with me. She told me that she feels as though I'm no longer happy with her. No matter how much I stress to her that this is not the case, I still don't think she believes me. I've scheduled an appointment to see a doctor about the depression (I did this hours before she told me this) early next week, and I really don't want to deal with this alone. So I ask you, what does a week off mean? How can I prove to her that I really love her as much as I do? I'm feeling very confused and lost right now. Please help me get some perspective on this situation.