Sorry to hear about that!
I was recently reading an article about highly successful losers by Paddy Upton(South African Cricket Team Leadership coach) In the end, he summarized these critical points to overcome disappointment/stress:

1. Feel the feeling – find it (sinking feeling in your stomach, a heaviness in your chest, tightness in the throat, heat in the forehead, etc because of stress) in your body, acknowledge it, and watch it subside.
2. Accept the result – it‘s part of sport and life. Assess the processes later
3. Support others – self-focus sinks, helping others uplifts
4. Reflect on preparation – what did you do well, what can you do better next time?
5. Reflect on the event – what did you do well, what will you do differently next time?
6. Commit to action – write it down, commit to action, ask for support.

I believe few of aforesaid points will help you reduce stress and concentrate on objectives again.

Sorry to hear about that!
I was recently reading an article about how people handle negative events by Paddy Upton(South African Cricket Team Leadership coach) In the end, he summarized these critical points to overcome disappointment/stress:

1. Feel the feeling – find it (sinking feeling in your stomach, a heaviness in your chest, tightness in the throat, heat in the forehead, etc because of stress) in your body, acknowledge it, and watch it subside.
2. Accept the result – it‘s part of sport and life. Assess the processes later
3. Support others – self-focus sinks, helping others uplifts
4. Reflect on preparation – what did you do well, what can you do better next time?
5. Reflect on the event – what did you do well, what will you do differently next time?
6. Commit to action – write it down, commit to action, ask for support.

I believe few of aforesaid points will help you reduce stress and concentrate on objectives again.