I'm 23 years old. Previously I was using dutasteride tablets and minoxidil lotion for 3 months on doctor's guide for hair loss. After 3 months I have stopped using them, from then I have noticed that i'm having problem in holding my penis hard. I have also observed that my penis is not as big as it previously used to be, it got shrinked (decreased in length when it gets hard). How can I be normal back?