I had surgery on 1/29/13 to remove an egg size meningioma, the surgeon had to cut my jaw muscle. My jaw pain was awful and I too couldn’t open my mouth very wide. I started physical therapy and she has helped me tremendously by doing myofascial release which is a form of soft tissue therapy. I still have jaw pain but it’s getting better with each treatment. So my advice is to not give up, keep trying different things to get relief (i.e. Physical Therapy; Massage; Accupuncture; Chiropractic).
Hope this helps!