Blackout from stress????

Hi guys!! I’ve been having something really weird happen so when I used to work I felt like I was blacking out and fainting and the only way to keep myself “awake” is to blink lots of times.

I never really thought hard about it until now when I’m going to my internship it’s the same blacking out feeling and it goes away after I’m done for the day??

Has anyone had this happen or know what this is?