Abnormal variations in the ST segment (depressed, but sometimes elevated) generally (but not always) signify a death of cardiac tissue. The dead tissue prevents a normal electrical pulse wave from being transmitted from the pacemaker site (the atria). First choice is to go to a clinic, where they will treat you for a nominal sum after a means test. It is serious because it generally indicates that there is an blockage of the main artery to the heart, which may require a stent. In times gone by a by-pass was often recommended. You need a full cardio work-up. Look on the internet for the nearest Hill-Burton hospital that will accept cardiac patients. Under Federal law, all hospitals who recieve federal aid must treat a certain number of patients without cost under the "Hill-Burton Act".
Sounds like you've had a mild heart attack. Start taking CoQ10, Cod Liver Oil and Flaxseed oil to strengthen your heart ASAP!