[cgriswald]

Sometimes the reason you are feeling depressed has nothing to do with how things are going. My depression was caused by things that had happened in the past and that I didn't spend any time consciously thinking about. Dealing with that stuff took some work, but once I did, my depression lifted and hasn't returned.

Depression means, even if things are going well, you can't feel good about it.

[ZeroFries]

Every effect is caused by something that happened in the past. The physical trauma of past situations reared its head. Sounds like an external factor to me.

[cgriswald]

I agree with the other poster. Either your point of view is tautological, or you aren't really talking about depression.