I'm sorry to hear that you have been feeling depressed. If it's something that you are comfortable with I would recommend seeing a therapist. No one, no matter how sick you are physically should have to deal with depression as well. It can sometimes be more debilitating than physical illness. When I was first diagnosed a little over a month ago I became very depressed. I was worried that my life as I knew it was over and I was just terrified. Recently I have began trying to be more optimistic and proactive about my mental health. In turn I have started to feel better physically as well. Although I have never been a runner (not only do I have Lupus, but I'm also very lazy haa) I have started to run and have felt significantly better from it (although I know it is not for everyone).
I have come to the realization that finding out that you have a chronic illness is much like grieving. According to Kubler-Ross, there are 5 stages of grief; denial, anger, bargaining, depression, and acceptance. When I first found of I had Lupus my friends and family tried to rush me too quickly towards acceptance. They immediately wanted me to be optimistic and in their minds to be healthy. But, I couldn't do that. I first had to walk through the other stages and deal with each one individually before I was ready to accept this. And also know that for all of us this process will be different, but I hope that the end result is similar and that you begin to feel better soon.
Lupus, Secondary Raynaud's Phenomenon, Pernio (Chilblains)