Most Helpful Guy
I'm in a similar state where the last few years have just been awful. Though not nearly to your level. I have had freind's betray me, bosses use me, and all of my freinds are unreliable.
The best way I found to get rid of stress is to find an active activity and just enjoy doing it. When your doing your sport or hobby just focus on that. Take a few hours and forget your worries for a time.
As for depression I still have no idea what to do about it but just talk with a freind that you can trust. It is hard when everything is filtered through that terrible shroud.