Another possibility is...
Phenothiazine reaction (Extrapyramidal Symptoms secondary to Phenothiazine administration)
OK its a long name(s). But is a syndrome caused by a certian class of medications known as Phenothiazines. They may cause a allergic reaction that may have such things as, abnormal eye movements, locked jaw at strange angles, a feeling of tongue thickness and painful muscle cramps in the face. And, as you can imanage difficulty speaking. Effects may be mild such as painful eye rolling, to wild, grotesque distortions of the neck, face and eyes.
Phenothiazines most common use is anti-anxiety and anti-nausa. The reaction may take up to two weeks to pop up.
Treatment is Benadryl. (oral for mild, IV for wild) or Cogentin.
Curval, you should discuss this possibilty w/ your MD/GP.
Oh, me? I was a Paramedic for 17 years before I became a cop.