S.G.
I had severe lock jaw two months ago; I completely understand your pain. I too could only open my mouth maybe one finger width. Went to the dentist; wasn't worth it..she tried to manipulate the jaw to no avail and suggested a mouth guard. No thanks! I got tired of squishing my sandwiches and eating soup.
So I went to my chiropractor and he showed me how to help rid of my freak TMJ, (happened with me sleeping with a hand under my jaw). Here are the chiropractor tips:
-Massage jaw from the inside: You insert your index finger behind the top back tooth and follow it downwards until you feel the jaw bone canal and massage by rotating your finger clockwise repeatedly but slowly. Do this a few times a day. (You know you'll have the right spot because it will hurt. Once the muscle relaxes it gets better.)
-Stretch the jaws: place your index finger and middle finger on the side of your left jaw and press to the right for 10 seconds, repeat the other direction.
-Alternate Stretching of Jaw: place your index fingers besides your nose and place your thumbs on your chin pressing downwards. repeat 3 to 5 times; 3 times a day.
-warm compresses on each side of the jaw a few times a day.
-sleep on your back if possible
-take tylenol when needed
-stay away from foods that cause to open your mouth widely and/or crunchy foods.
I did this for a few weeks continuously and was finally able to open my mouth to 3 fingers width. I still repeat all the above steps except the last one because I love pickles and saltless tortilla chips. I've been doing well.
I hope that you get to feeling better soon.