What other options for severe depression other than medication?

I believe that there needs to be another way other than medication for depression and I would like to know if someone knows about a way. If one got oneself in an chemical imbalance there should be a way out of it without drugs. And, antidepressant are for some specific type of neurotrasmissor imbalance, isnt that wrong said? I mean our body are made of many many types of things, chemically speaking they are a few how come only one is asociated with depression in this case.