Hi LR -
I have been going to the same chiropractor since 2002. It was the chiropractor who told me to get to a neurologist because he thought I had MS. This was after going to multiple doctors over a period of years who could not find anything wrong with me. So, my experience is probably the opposite of yours. The good doc treats about 50 MS patients with adjustment and acupuncture. He has been in contact with Dr. Dake in reference to CCSVI. I thought you might be interested in the two articles linked below.
The doctor does not "crank" on my neck or my spine. He uses a chiropractic adjustment tool to get things back in alignment. One could argue that by keeping the spine and the neck in alignment, the veins are given more room---maybe they are not as apt to get twisted or squished.