I was taking the SJW for 2 months. I am now on Luvox. I cried all the time, had no energy and really no will to live anymore. I have found several good sites on depression. It is worth reading up on it.
Depression is very common but unfortunately people look at depression as a bad thing.
My friend suggested I keep a journal. I have also been told to make notes on when I feel down in the day. That way, I can try to figure out why I feel worse at certain times a day. Be supportive towards your Mom. This is not easy on her.