Getting some Bob Ross vibes. I can just hear him saying "phtalo blue" and "happy little trees."I mentioned this before a long time ago on some forgotten thread ... I use a grounding technique taught to me by some coach back in my college days (soccer for the nerves before a penalty kick or for shoot outs).
Find an object in the distance, and in your mind take a small brush and paint it a different color using small careful strokes.
I usually pick a bush, a tree or a cloud. I usually paint it some form of deep blue.
It takes under 10 seconds and I am completely settled down.
Works nicely before a serve or a tough return.
Maybe I will try this next time my serve goes awol. Happened yesterday actually.