Just a thought, redzonebikes - how deeply has your doctor gone into this with you?
Is this problem only when you're with girls, or do you have a problem, say at a lads night out at a strip club or when you're alone with a girlie mag or girlie images on your pc screen?
Do you have a strong desire for sex, or are there no real urges?
When you're alone, can you get and erection and can you maintain it?
Do you ejaculate and is your penis erect at that stage?
Really and truly, a doctor needs to be in possession of all the facts - unfortunately, many have a stereotype image of ed - I have had to put the men's health forum of our own nhs right on that score!
I really, really hope you can get an answer to your problems! A few things you could try:
1. As much exposure to natural sunlight as possible - ie a holiday (vacation) in a sunny place. (the gland producing testosterone is much more active in sunlight - it is located somewhere around the eyes)
2. Try taking multi-vitamin supplements, just for a few weeks. Sometimes physical ed problems can be down to vitamin deficiency.
3. Try eating oily fish - sardines, mackarel, tuna etc a couple of times a week. Not only do the oily fish properties help with brain power, they can enhance the sex drive too.
4. Relax, chill and try gentle stroking exercises on your old john thomas when taking a bath!
Good luck and keep smiling!