Since yesterday i'm feeling like fluttering in my chest and throat every 30 minutes and right after that sometimes i feel like i have to cough or burp, it doesn't hurt, bp is ok, not taking any medication, don't have any conditions. whats is this?

I doubt the significance of our symptoms. However, if symptoms keep returning in the next 24 hours, you should see your doctor. By the way, when you have that symptom you should do this Valsava maneuver "take a big deep breath, hold your breath then bear it down like you strain for bowel movement" and see if that terminates the symptom. Let your doc know if this maneuver effective or not.