What Causes Excruciating Pain In Groin And Erectile Dysfunction?

I have had pain in my groin area for several years. I was first treated for prostatitis, then told I had seminal vasiculitis, but I am 58 years old, had a hernia operation at the age of 16. When I become aroused now, I often have excruciating pain in the groin area. I was recently told I have pelvic floor pain. What do I do? I recently had a second opinion and was told this. I also had a major dye enhanced scan of the area and was told nothing appears to be wrong structurally. I am also experiencing erectile dysfunction with this pain.