i am only a nursing student but the symptoms your experiencing do not sound related to the abcess.
if you have severe anxiety sometimes you cant get enough oxygen
to your heart because you are "stressing" out. that can cause palpatations or feelings like your heart skips a beat. My advice to you is when this happens
1. Stop and take a deep breath in and hold it 5sec
2. If you have anxiety medication
3. take some more long deep breaths.
usually this will cure the discomfort. Hope this helps!