Courtney,
I'm sorry to hear of your struggles; it does sound like you've tried many things to get things under control.
Dr. Dan Amen, one of the pioneers in SPECTs, has a directory on his website of professionals who work with ADHD. Some of them offer SPECT. Check it out at http://amenclinics.com/ac/referrals/
If you don't see anyone listed in your area, try calling his office. They've been helpful to me in the past when I've asked for names of clinicians who do SPECT scans outside of Dr. Amen's area. You can find the contact information at his website at http://amenclinics.com/
Hope this helps!
Terry
PS Dr. Amen's clinics are in California, but I believe he also has one in Virginia.