<s>[INST] Well I am a forty eight years old female that began to have rapid heart and pluse rates accompanied with some burping.  I was give a series of test blood and cardio. The results did not point to a cause my cardiaologist prescribed cardia xt 120. The systems subsided but have returned what is happening? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, you're all symptoms are related to stress and anxiety. At your age of 48 years, chances of menopause is more. During this period, females tend to have hormonal changes like low estrogen, progesterone etc. And these hormonal changes can cause mood swings, stress, anxiety etc. And all these can cause rapid heart rate, burping etc. So better to consult gynecologist and get done hormone levels. You may need hormone replacement therapy (HRT) and anxiolytic Chat Doctor.  Don't worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>