I've Been Having Heart Problems Now For The Past Few

I've been having heart problems now for the past few weeks it started of with pain down the right side an in the breast but now it's discomfort in the middle of mg chest an the left side of me has sharp pain I've been getting heartburn an lightheaded my back at the back of my breast Is sore an my heart is racing which the doctor gave me tablets to slow down but it hasn't took anything away what should I do or could this be?