My mouth stiffens when too much talking's done so as my mouth sometimes. Why? how can i get rid of it? please.

my mouth or lips closes itself. It's like a sorta stiffened and i can hardly utter a word wen it's like that. I'm doing a job which involoves alot of verbal communications skill. A nurse once told me that i need to go a doctor who specializes 'Nerve' things. but i think that'll cost me a lot. Please gimme some remedies or tips to atleast minimize it. Thank You.
Answer:
Take some motrin, never chew any more gum and stop talking so much. Find a new job if you have to.

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