Progressing tightness in left hand/foot up forearm with pain and few cold spots and tingling left upper rib and left side of back, heart palpatations?

Cardiac? It would be helpful if we know your age and other medical conditions (diabetes, cholesterol issue etc). But if you were over 40, I would suspect a coronary artery issue. It is best that you consult a cardiologist ASAP. If one is not available, go to the ER. Better safe than sorry. .