"To get a grip" means to gain control over one's emotions, thoughts, or actions. It implies getting a hold on a situation or oneself, often in order to handle it better or to stop feeling overwhelmed. Full definition
They never gave themselves a fighting chance of getting a grip on the game here — and were fortunate it did not cost them dear for the second weekend in a row. (espnfc.com.ar)
My purpose in writing this celiac and grain free eBook was to help the many people struggling with body issues that they just can not get a grip on. (glutenfreehelp.info)
Get a grip people and learn about something before you blindly do something. (religion.blogs.cnn.com)