I had Botox in my jaw done 15 units each side. Worked great. Went back after 3 months to get redone and was great for 3 weeks and then bam - headaches and my jaw is EXHAUSTED. Second time I did 15/20 units (20 on my bad side) I can move my jaw muscles more this time. Did they put it in the wrong spot? Should I go back for more?