Female Age 66, Type 1 Diabetic (Pump Stable Control) Underactive

Female age 66, type 1 diabetic (Pump stable control) underactive thyroid, high systolic BP and low diastolic BP average readings 140/50 and now been advised that after heart stress/resting scans that although my heart is pumping well blood is not reaching 10% of the heart muscle. Booked for an angiogram in three weeks but wondered what it means and possible treatments e.g. stent. Thanks for any advice