MY NAME IS DARREL. I Am 72 Years Old. I

MY NAME IS DARREL. I am 72 years old. I had a heart attack in October of 2016 and had two stents placed into my heart. I am taking Eliquis, Atorvastatin, and Lisinopril. Even with Sildenafil or Cialis I am still having trouble getting an errection that can be maintained long enough to have intercourse. My doctor agreed to allow me to return to an injection of 0.5 ML of testosterone every 14 days. The problem still exists.
Is there any recommendation you can make to help my situation.