I agree you need to regulate your emotions to best stay relaxed and focused. Read Dr Allen Fox's book The Mental Game or similar title. Fox talks about staying calm and showing no emotion between points. He also talks about staying focused and building intensity on key points. Federer is probably the role model for Fox's book as he mostly stays calm but shows some emotion at key moments to pump himself up a bit.
I don't think you can pump yourself up after each and every point with a fist pump and a yell, or you will end up drained and likely make your opponent want to beat you more than they already want to beat you.