Suggest Remedy For Severe Chest Pains

Having bad chest pain upper side slightly to the left. Been going for a couple of hours, not getting worse, but feeling more dizzy. Left arm aches and feels weak. Breathing a little shallow, throat feels constricted. Over the time vision has become a bit blurry, ringing in left ear and sweats. Went into emergency a week ago with similar problems, although last time it was after exercising. Had an ECG which had flattening T waves, told to follow up with another ECG with GP. Still waiting for this appointment. Is this an emergency or can I wait until tomorrow? Thanks.