Botox for TMJ Made Jaw Worse

I have had a 20 year + TMJ issue. I got 20 ccs of botox on each side about 6 weeks ago. It helped, but I still had a dull pain, so the doctor had added 12 or 8 cc's on each side. One week after I started having shooting pains and feel like my jaw is glued shut, making it painful to talk, chew, smile or laugh. I have never had this sensation before and don't know why I would feel worse than I did before I got the initial botox. The doctor's office suggested to add MORE. Help?