Thanks for writing in.
I am a qualified and certified cardiologist.
It is only 3 weeks and some symptoms you will have to bear with for some more time. In that respect your doctor is right. However, you can request your doctor to give you some prescription medicines like Metoclorpramide for relief with gastric problem and burping. You have some symptoms of gastro esophageal reflux disease
for which this drug will help too. You can also buy some antacids OTC and take one and three hours after meals. You are young woman with normal echocardiogram
and EKG so it is absolutely certain that whatever your indiscretions might have been your heart had remained unaffected. It is absolutely normal. Enjoy your life do exercise, no junk food no junk thoughts no junk medicines. I can understand your discomfort now but it is matter of weeks before you will realize that you have gotten over withdrawal how much you have gained. Good Luck.
Dr Anil Grover