Erectile dysfunction. Solution!

Sir i m 25 yrs ,6 feet ,65kg facing problem of ed from 4 to 5 yrs . I use to watch porn and masterbate but suddenly erection was not there without porn i went to sexologist he check me and told blood flow is 68% and gave me medican ayurvedice tables for 8 month for blood flow, sperm count,muscle weakness. Now my treatment is over 12 days ago but after 7th day onwards problem start occuring now i have to imagine more intensely to get erect and its not erect fully first few days after treatment it was easy to get erect but not now but if i watch porn then it get erect easily. I want to doctor he check me told that blood flow is 96%,sperm count is good muscle r good but why is it difficult to achive erection pr maintain it for long .so can i use allopathic treatment. .and befor treatment i use vigra for making love it work efficiently always but i want permanent solution