Suggest Treatment For 40% Blockage In Heart Arteries

I am having heart attack like symptoms. Had cardiac cath done & there was 40percent blockage. Discharged 7 days ago & am having same signs, those of a severe heart attack. Saw famile Dr. he said more than likely gallbladder and said it may be dissolved or something strange I did not understand. Not dissolved but very soluble?. Can u tell me what he may have meant. Have appt in 10 days for some sort of ultra-sound w/radiation shot? Thank you