No real surprise about your doctor. Most of us have had similar experiences from ridicule to complete disbelief.
Metametrix has an area on their site where you can request a dr or chiro in your area who is already set up to order a test for you. I am currently in the process of trying to do this.
I have fought worms and parasites with "natural" means for 2 yrs and am just overrun and have made no progress in spite of numerous herbal products and treatments. Perhaps if I can identify or "prove" to drs what I have, I can get some help, or at least fine-tune my own efforts.