Not sure, but might be able to ask someone for you, as I know a few TCM's.....not sure if its diagnosed much over here though, so I wouldn't hold out for a TCM remedy!

Full spectrum, natural light florescent light tube work. 

  I do understand SAD is very real for some people, fortunately for me (in a way) I was born in London and the weather is ALWAYS crap there, so you kind of get used to it. I wish I had something more useful to say to you but having experienced severe depression in my younger days I found that what worked for me was to put on the most positive front possible and push forward with your best foot and all that. Exerting a positive mental attitude releases endorphins in your body which in turn battle the negative encryptions of your psychological DNA for supremacy. What starts as a fake front becomes a natural state of being. I don't mean to undermine your struggle with an answer that to you may sound blase, but it's my honest 5 cents.

  I'll leave you with a story though, hopefully to give you a laugh. When I moved here 7 years ago it was as a man who'd had a mixture of troubles over the years, not that i'll bore you with details, but I decided that seeing as I was about to leave a very handy national healthcare system I may as well visit a shrink for free (i'd never spoken to a professional about my bwwwrain before) and see if they could give me an overhaul so to speak. I mean, I knew i'd defeated the worst of my demons but it still seemed to make sense to make a visit for a general, psychological touch-up if you will, and I still had a month before I was due to leave. So I get my appointment, go in for the visit and sit down with this very stereotypical looking psychoanalyst (corduroy jacket with patches on the sleeve and a measured look of almost patronizing understand is how I remember him) who asks me to tell him why I was there. I didn't much think about it, just opened my gob and started to talking and before I knew it an hour had flown by without a word from senor shrink. I stopped as he started to look at his watch and the room fell deathly quiet. Old doctor shrink just sat there looking at a pad on his lap that probably sported three simple words; 'Just plain nuts' and then told me with a sigh that in his professional opinion I needed at least two years of intensive psychotherapy and that it was highly inadvisable for me to make plans to start a new life in China before I did anything else. I bid him good day, took a mint and was on a plane a month later. 

  All the best to you, Beetlebee.

Live in Shenzhen, guaranteed sunshine even in January and February

I'm not sure what this is but I can take a guess.

Where I'm from the weather was always good, living in China I've noticed there are days I feel like crap because of the weather. I just look outside the window and I don't feel motivated/happy.

Going try buying some lights like others suggested.