I have always been told it is a chemical imbalance in the brain, though for a while it was my situation. My first marraige wasn't the best. Husband always tried to control me. Then he died of cancer and I had a real hard time. I have always struggled with anxiety,but never really was told that my depression came from that, but always was working on anxiety issues. Also I had very low self esteem. So in therapy that is what we worked on along with the anxiety.
After husband died, I tried to start my floral and plant nursery. Everything kept going wrong, but I kept trying. When I finally got to the destination (floral) I ended up getting fibromyalgia. Then the business folded. I was in severe debt. Anxiety came back. So did the depression, but doctor said it was from the stress. Which makes us anxious. So even though the doctor didn't specifically say that anxiety caused depression, I think that it played a part in that, along with the stress. So I do think that they can go hand in hand, but couldn't say which causes which. I think like you say, when we are depressed, we don't want to even see people. That in turn could make me very anxious. So I kind of feel your theory is more accurate than that of the doctor. But down the road when everything makes more sense, I think you will see which causes which. It is a tough call.
I hope that you are feeling better today.
fibromyalgia, Chronic fatigue, depression,allergies