As to depression, I have found attention to certain dietary details can make depression less often, less severe, and of shorter duration. These are mainly the taking of two different probiotics, one in the morning and the other one at night, daily. Each probiotic needs a high strain count, like 15 to perhaps 23.
Also you may need to take a bio-available folate supplement to battle depression. I do. The positive effect of this can be very strong.
If the above has helped with depression to the point it is no longer constant, depression will still hit once in a while. This is when Bergamot essential oil and Lavender essential oil is handy. Two drops of each rubbed between the hands and sniffed for a minute or so from hands cupped over the nose gives a mood lift in say 20 minutes or so in my experience.