My dad had a heart attack this morning and i'm scared. could he get another one soon?

Yes but!!!: There is always that chance but i assume your father went to the hospital. He may have had an emergency cardiac cath with or without stent. If not, he is probably on antiplatelet/hypetensive medications, cholesterol medication, Aspirin etc. Normally, an interventional cardiologist will evaluate all of the coronaries and decide which ones need treatment. Sometimes, the patient needs surgery.

Possible: But since he has a diagnosis, the docs will treat and evaluate and decide about cardiac studies, catheterization and angiogram and see if he is a candidate for dilation-stenting, or coronary artery bypass.