hello doctor, i am 20 years old..i am in living relationship with girl.one day when i came back to my home in holidays, i try to masturbate, but my penis was not getting erect, then i went to one ayurvedic doctor, he gave me medicine of increasing will power, then after eating for a week, i started getting erection but only when i stimulated my penis with hand....now 5 months has passed, i got erection when i am with my gf, but still when i am alone, its difficult for me to get an erection, like i used to have before 2 years.and i got only when i am laying on bed, not when em standing or sit.also one more thing, if i dont get stimulations continuously, my erection starts decreasing within 5 to 10 seconds, and about morning erections, i got them daily, when em sleepy. nd when i wake up, it goes down.....one more thing which i want to tell you...in the starting of my relationship..i used to eat ayurvedic medicine for last longing....my penis used to erect for long time after eating that..i think it may be side effect of those caplsules.but it was ayurvedic..plz give me a correct diagnosis..