After eating, i frequently burp and this causes me to regurgitate some of my food into my throats. what causes this? it feels really irritates.

Reflux: It sounds like you have reflux (where acid and sometimes food come back up). You need to see a gastroenterologist to have this worked up (a scope down your esophagus to see why this may be happening). In the mean time, you can change things regarding your diet to try and alleviate these issues (don't eat late at night, don't go straight to bed, avoid caffeine, avoid chocolate, etc).