It is like which came first the chicken or the egg? I am older than you with some of the same list of ailments. One does seem to heighten the other, but
the predisposition to depression probably comes first and the way we treat ourselves causes the physical problems.
I understand the loss of not being able to have children. I love them and never had any. After I found out that I needed a hysterectomy, someone else in the office lost a 3 month premature child. My heart broke for her but I could not go to the funeral.
Take care of yourself emotionally and physically