I'm not really sure what came first, depression or avoidance/SA, but I think it was the SA. Then as the SA got worse and avoidance kicked in, there came the depression. So I feel that the avoidance is the most important thing to address, then there probably wouldn't be a reason for depression. However, depression cripples you, sapping your motivation to do anything, so I'd probably want to be on some kind of medication or doing at least a little bit to tackle the depression so that facing the avoidance/SA issues seem more realistic. So in other words, both at the same time. But if I could only treat one, it would definitely be the SA, because just treating depression would be futile, it would keep coming back if the SA were still there.