There are a few other causes :
1) my health - I feel low in energy and have breathing problem. 24/7. I guess I have to talk to my doc about my breathing problem.It's bothering me a lot;
2) my short term memory problems - I am not able to work cause of these and this makes me worry about money in the future. In my country we don't have disability;
3) the process of immigrating to usa is long and complicated. I worry when my bf and I will be united.

But I still think my depression is mostly biological.