I would imagine it depends what medication the donor is on as to whether you can use them or not. Is this something you can ask your GI or family doctor?
I think you need to take your closest friend aside and explain to them how serious your condition is and how their help could make a difference.
Another option is the Bright Medical Clinic in Oregon. I believe they have a donor bank (not 100% sure on that).
It must be very frustrating for you. Keep plugging away and I'm sure you will find someone.