How to deal with setbacks - advice, experience, opinions?

Setbacks I have learned come and go and they are horrible, but they are always there. I have noticed if I keep busy and do not give any time to sit alone and think they are fewer. Depression for me can hit when a loved one come and visits me and then goes back to their state of residence or even if my fiance leaves for a week.. it can cause depression to come back. I try to stay very busy during times where I know triggers are there.

Before health took turn for worse I thought things looking up now all do is cry sleep and try get buy June 2017 finally got god job I thought oh yes finally 2 months later one by one things went down hill ended up having leave job...