Hello, although naproxen may (rarely though) cause palpitations and the same applies for infections and any kind of pain but the most likely cause is your atrial fibrillation. Atrial fibrillation may cause attacks of fast heart rate which can be corrected with drugs like bisoprolol. I can t say about the pastilles because it s not actually a drug with documented effects. Perhaps you should discuss this with your cardiologist. An ECG recording when you have symptoms will probably clarify the issue. I hope you find my comments helpful! You can contact me again, if you d like any clarification or further information. Kind regards!