Same here, I take aspirin, ticagrelor and rivaroxaban everyday after stent placement. These blood thinning medications especially aspirin affect the gastro intestinal tract. My doctor advised me to take antacid medications twice a day to counter this issue. It helped for 4-5 days, now again I have burning sensation in my tummy back again. I will wait for a few days and meet my cardiologist again. As of now I don't have a solution for this.