Hi Andy,
I have quite a few things in common with you. I wrote to my lady for about six months before meeting her. I met her in exactly the same week you met your lady. She is also from Changsha. And we miss each other terribly.
Apart from all the helpful advice that has been given so far, I would recommend doing something physical. Take a picture of snow, like Arnold. Make something for her with your hands. I am carving a small stone sculpture. I always find that doing something physical and practical gets me out of my head, which can be a dangerous place when it gets too introspective. Thoughts, left to their own devices for too long just go around in circles - it's unhealthy. If I get stuck in a thought pattern, I have to go somewhere, go for a walk, or I have to do something, make something and that breaks the cycle.
I feel I need to be strong for her, strong for the both of us, and it helps neither of us if we are both depressed at the same time. So I just do something small that furthers our relationship, but brings s closer. And ultimately, after I have done it, I realise that I am suddenly a few hours closer to seeing her again.
Yesterday, I went to my Chinese class. Today, I went to see a film with my sister, who told me she already loves my lady, because she makes me happy