I’m a 37-year-old man diagnosed with high blood pressure a year ago. I take Amocal (amlodipine bp, 5 mg). My problem is that when my wife and I want to have sex, sometimes, not always, my penis does not become erect. Other times it does. I’ve never had this problem before. I have not discussed it with my doctor.What should I do? Is it psychological or physical? Please advise.