Maybe a penis pump surgical implant would help.

Have you been convicted to a disease STD or sexually transmitted disease? that could be one of the factors why you experience that kind of problem. Personally speaking, I had an STD especifically the gonorrhea at the age of 21, I guess this is the reason why my penis is not working anymore but I haven't gone to a doctor for a consultation because I am very much afraid and the same time very much ashame to the result of his diagnosis.