What seems most likely is that a muscle in the pelvic floor is cramped from overtraining and has become chronic. The cramping restricts bloodflow and the reason it is better when lying down or peeing is because the muscle relaxes more when you do it. I have hard flaccid and have had major improvements from seeing a physical therapist who has given me trigger point massages in the area around the pelvic. There is a closed forum that you can go and read on this issue if you google hard flaccid. Even though there are only seven reports of people being cured there are a lot more people that have been cured of this.