Angina is serious, but it's only a symptom. Get an arterial and/or cardiac calcium plaque scan for the real story.
If you do have blockages, start doing everything you can to increase vascularity. Yeah, surgery might be necessary, but talk to at least three competent heart doctors before signing up for anything.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.