I've been experiencing pain in the same area, seeing a Pysio Therapst three times and then getting reffered to a massage therapist, the RMT is amazing they don't just massage they fix and give you stretches, it's wonderful.
Don't waste any time in getting that MRI. Sounds like you're having the same sypmtoms I did. The docs told me I pulled a muscle. 6 weeks later, when it hadn't gotten any better, I pushed to get an MRI and I had 2 herniated cervical disks. I would ditch the chiropracter and get into physical therapy with massage and ultrasound. Good luck.
X-rays show bones, MRI's show tissue. Get an MRI...one with contrast if at all possible.