The trismus is tough. While this comment is of no benefit to you now, I can not emphasize enough how important it is to do the stretching exercises DURING the treatments, it makes all the difference later. You can still increase your range of motion and the amount that you can open using daily stretching techniques. I used tongue depressors stacked up, and each day tried to get one more in the pile. The Therabite device gets great reviews from everyone that I have heard that has used it. The scar tissue becomes harder to deal with and reverse as time passes.... severely limiting peoples ability to open widely enough to eat and speak properly. Regarding the pain, I am the wrong one to ask