@nbkod7b, not being able to open your mouth is horrible. The exercises they gave me to do did not all involve opening the mouth. Some were just using the muscle we use to swallow, trying to pretend to be swallowing about 20 times, twice per day. Another involved lifting the tongue to the roof of the mouth, then moving it from side to side (inside cheek to cheek). Then, rotating the tongue in a circular motion over and over. Many did involve opening the mouth. One thing that greatly helped with my neck and chin Lymphoma was one of those vintage, electric neck massagers. Here is a search title that shows one on eBay:
"Homedics Shogun Shiatsu Kneading 2 Way Neck Head Massager Portable SM 444."
Another suggestion would be "Red-Light Therapy." This healing light helps many conditions if utilized consistently. Did you get the lymphoma from radiation treatment? Have you tried any type of therapy for your condition, such as massage? Is this temporary? Sometimes, time will heal these things. It was over one year before my voice came back. Also, the speech therapist did not want my feeding tube removed, but it fell off me. I then became determined to rev-up the exercises, massages, red-light, and with time it did get better. Please keep me informed of any progress. Best of wishes.