> But, there are lifestyle and "spiritual" things that can be done to help treat depression

(I am the OP on going through loss and sadness and not being depressed.)

Yes 100% correct. Just like if you have heart disease or a bad back their are non-medical activities that will help those medical condition. My statement is that their is a medical piece that people discount and/or actually dismiss. A person can't just "fix themselves" and having the medical piece help them with treatment with counseling is a big help. Depression isn't that your sad.

Depression Definition: Clinical depression is a mood disorder in which feelings of sadness, loss, anger, or frustration interfere with everyday life for weeks or more.

Symptoms of depression include:

    Low mood or irritable mood most of the time


    Trouble sleeping or sleeping too much


    A big change in appetite, often with weight gain or loss
    Tiredness and lack of energy


    Feelings of worthlessness, self-hate, and guilt


    Difficulty concentrating


    Slow or fast movements


    Lack of activity and avoiding usual activities


    Feeling hopeless or helpless


    Repeated thoughts of death or suicide


    Lack of pleasure in activities you usually enjoy, including sex 

https://www.nlm.nih.gov/medlineplus/ency/article/003213.htm