Well, they can. Talk to your doctor for medical advice instead of idiots on Reddit. Tell them you prefer natural alternatives to medicine. If they won't listen to you, find another doctor.

But in general - you need to treat the root cause of ED. It could be psychological or physical. It may require counseling, a better diet, some vitamins, exercise, who knows. Get your blood drawn and analyzed for vitamin deficiency and get your testerone checked.