Had Stent Placed In LAD. Stress Test Normal. Have Chest Pain And Palpitations. What Is It?

Hello. I am 40 y/o, male, had a stent placed in LAD about 3 months ago, did not have MI. After stent was placed I had stress test one month post procedure and it was normal. I am still getting chest pains all the time on and off and strange feeling like palpitations and machinery sounds in my legs, HR and BP is normal. What is it? Should I see noninvasive cardiologist? I never had these symptoms before stent was placed. Thank you very much