Bpm 46 (normal 56), indigestion, tight chest and throat. could these be symptoms of a heart attack?

Yes.: Unlikely but possible. Best to have an ekg even if it means visit to urgent care.

Tight Chest: Heart attack sx can include: chest pain or tightness, shortness of breath, increased sweating pain or numbness radiating down the arm (more often left than right) and nausea. There could be pain in the upper back, head, jaw or teeth. One fourth of people have heart attacks without chest pain. I agree with dr. Fisher about getting it checked out.