Hi Jeff, You say you can hold an erection for around 10 minutes but lose it when you are about to be intimate with your girlfriend. It sounds like it could be 'performance anxiety' to me. Which means when you are by yourself, you are fine, but when you feel you have to 'do the right thing' by your girlfriend, that's when you have problems. Have a think about that, and do see a good doctor, like a urologist, who you trust and have him/her do some tests to rule out other things that might be going on xxx
Hello. Metropolis got the point. You need to visit a doctor. A proper one, who won’t just give You some pills, but will really help You. Your accident was quite long ago, so it’s very worrying that You still have problems. Your ED can be only a small part of problems caused by Your accident and nerve damage. Better check it sooner than later, when You could have bigger problems. Wish You luck!
There are cases of ED caused by bycicle accidents but it's premature to say that this is what happened to you. Go see a urologist, only a doctor can determine the exact cause of your problem and prescribe an adequate treatment. Self-medication (and that includes 'natural' treatments, too) is always a risk.