Yet I still have episodes where I sometimes can't get out of bed, or can't bring myself to leave the house. A couple of months ago I spent three days just sitting (and occasionally sleeping) in a chair, not even getting up to eat or shower. I just simply couldn't do it.
While it's true that people can experience temporary depressive episodes due to 'exogenous' factors (e.g. the death of a loved one), it is very different to 'endogenous' depression, and requires different types of treatment. While talk therapy and time can be very helpful for people to work through difficult and temporary 'adverse circumstances', it is of little help for endogenous/biological depression.
No amount of 'talk therapy' can convince my pre-frontal cortex to operate within 'normal' parameters or to get my brain to produce appropriate quantities of neurotransmitters like serotonin, dopamine and noradrenaline. I'm reasonably sure this is a chronic illness that I will never be rid of (as I've learned from 15 years of failed treatment attempts). On the upside, there's a good chance that there is some treatment out there, coupled with sustained lifestyle changes, that will allow me to stave off the symptoms so that I can live a relatively 'normal' life. In some ways it's similar to how type 1 diabetics can survive and live normal lives with regular injections of insulin.