I don't know how on earth we do it. How do we get out of bed every day knowing that even if something moderately good happens to us, it'll just be overshadowed by something monumentally horrible not too much later.
Get a new job, lose your best friend. Get into a good school, lose your home. Meet a partner, lose them later. It seems like life saves the big whammies for when we're actually starting to feel good. That's when we get sick, when we see the inside of a hospital again for the first time in years. That's when we get medicated beyond belief and get told we'll never be able to do what we want to.