Hello Doctor, I have been suffering from erectile dysfunction for the past 6 years. It started immediately after an incident during which I heard a "pop" sound followed by a sudden loss of erection. Since then, I have not regained normal erections or regular morning erections, and my quality of life has been significantly affected. I underwent a routine penile ultrasound in the flaccid state, and the report was normal. Based on this, the urologists I consulted advised that a dynamic penile Doppler is not required and suggested that my problem is more likely psychological than physical. However, because my symptoms started suddenly after that incident, I am concerned that there could be an underlying physical cause, such as a vascular or nerve injury. I would appreciate your opinion on whether further evaluation is necessary and what investigations or treatment you would recommend to determine the exact cause of my condition.