The views expressed by me are for educational purposes only and do not establish a doctor patient relationship.
Thanks for your question.
Oxycodone can sometimes cause heart palpitation.
This can be due to the change in manufacturing formulation if you are using different brand.
Anxiety and stress also can cause palpitations.
You can discuss with your doctor and pharmacisy to find out if this is a different formulation of oxycodone.
Also get a EKG to get your heart checked and reasure your mind.
Does not sound serious though.