Question

داری چی می گی ؟خودتو کنترل کن که یه چیزی نگی بعدا پشیمون شی ؟

Answer 1

calm down or you will regret what you said.

Answer 2

watch what you say/your tongue/your language/your mouth etc. and control yourself so that you wouldn't become / prove to be regretful / remorseful later on.
 

Answer 3

What are you saying? Get a grip on yourself so that you won't tell something you will be regretful about later / in the future.