What Causes Sinus Infection Followed By Heart Palpitations?

i have had sinus cold 2 times this winter and my heart palpitates i have had heart monitor on ekgs all say sinus rythm its very uncomfortable when it happens no pain just feels strange is it my sinus colds doing it is this natural my dr said my nheart palpitations and diagnosis is nothing to worry abougt is itdamaging my heart i m 20 pounds overweight and i smoke i get palps when over exeting myself