How can I get better?

My girlfriend and I recently split? I'm not really sure if we are together or not, but I know she wants time away from me. So I told her to take her time and to come back to me later with an answer. I'm afraid that she's going to say she doesn't want to be with me anymore, and that makes me really sad. I've been depressed for so long and waiting like this gives me so much anxiety. What can I do in the mean time? To help myself? I don't want to forget about her but thinking about her kills me. Everything I see reminds me of her and I don't know what to do.

By the way, we've been together for a little more than two years. If that changes anything.