I recently been having this feeling like my heart in pounding in your throat and i feel like i can't breathe...what does that mean? i also have ibs...

Palpitations: Sounds like you're having extra heart beats. To make the diagnosis need to go see your doc.

Anxiety/Panic: If other problems were ruled out, might be anxiety. Panic attacks can include chest pain or pressure, shortness of breath, perspiration, stomach pain/nausea or other GI problems. Rapid heart rate and a sense of dread or fear of losing control may occur also. Seek out a psychologist or other mental health professional for help.