Many of these are quite reasonable. Especially in the tropics it is hard to make yourself get proper exercise, but for your mental health you must find a way. Chemical imbalances from simple pre-menstrual stress to thyroid problems cause depression. After the birth of a baby and when menopause nears we can have hormone imbalances that cause mild to serious depression. The next time you have the opportunity to have a thorough medical check up, make the appointment and keep it.
Treatment is simple and usually fairly inexpensive.
Emotions can cause depression. Lacking meaningful work and worthwhile goals, not using one's abilities, unmet needs and unfulfilled dreams can all happen to PWs. Usually our husband has been called to the work he is doing overseas. We, however, may be there only because we are his wife. Keeping a home and raising a family in another culture may not seem like meaningful work and worthwhile goals.