Hi fiesti -
Welcome to the Healing Well forum. I am so sorry to hear that you are going through so much right now. My father recently had a stroke and while he was in the hospital the doctors found cancer. Luckily, it was not cancer, it was a cyst, which was subsequently removed. He is actually coming home today. :) To me, the worst part was the waiting for a diagnosis. I mean once we got a diagnose we could begin to think in those terms and analyze the different treatment options, so my heart goes out to you during this time when time seems to stand still waiting to hear from your dad's doctors.
I have never taken any medications for my depression, so I cannot comment on that aspect of your post, but I would like to offer a suggestion. You may have already thought of this, but if not I'll add it just in case. If you feel that you do not want to sit in an emergency room, but still need to talk to your doctor, he should be able to be reached via his emergency number. Or if he is not on-call he should have another doctor covering for him. Perhaps, he/she can assist you.
My depression is also usually triggered by a major stress event. So, I understand some of what you are going through. There are a lot of caring and supportive people on this site, so please feel free to come and post here often.
I hope you start to feel better soon.