I take 25 mg. of Atenolol for heart irregularity. Sometimes my h...

I take 25 mg. of Atenolol for heart irregularity. Sometimes my heart rate elevates to over 300/bpm. Has Flonase been found to contribute to that? Since taking Flonase (4 weeks), I have had more episodes of the irregularity and that is new. The Atenolol had kept me stable for over a year. This happened to me one time before while taking Flonase (increased episodes of irregular heart rate) and I suspected Flonase so discontinued its usage. I am, however, under some new pressure and stress so don't want to blame Flonase if it's not known to cause this problem. Thank you. Jennifer