Find contentment in the little things. A beautiful sunset, the song of birds, maybe music you love or a film or a book. Give yourself something to look forward to, but not something too far away and grand. Little and often, as is true of many things, is the best way. Talk to people, but listen too - you'd be amazed at some of the things people say, often unintentionally.
If I remember correctly, you're a paramedic, or were, so you've had a huge and beneficial impact on people's lives in a way that 99% of us on this forum can't even start to compare with. You've had the guts also to take on children with real needs, who weren't your own - not many would do that. You have every reason to take pride in what you've achieved.
Oh, and you support the greatest football team in the world (despite the evidence of the last 45 mins).