Suggest Remedy For Erectile Dysfunction

Hi , My age is 25 years . I am doing Masturubation from past 6,years ..Everythinv qas good and I was satisfied...From past 3 days my Pennis is not becoming strong even if I think for nude girls and see some porn also ...Am I good for sex ? wat might b the problem ? I am really worried about this as am getting married in a month ..please reply .