The mouth movements are something different. The moving lips, lips and tongue, and/or inability to stop the movement characterize this as something else entirely
There's a specific name for this that evades me (suprise) of the same jargon-y ilk as "Formication - the sensation that bugs are crawling beneath the skin". It is strongly associated with anti-psychotics, thorazine espec.
Times ago, I would juice benzadrex inhalers (blechh!) and the jaw clench was such that, examined inthe mirror, my tounge would have tooth marks down the sides, distinct as a well done brass rubbing. All other ill effects available were also present in very large supply: prostate, skin, bloodpressure, paranoia, shadow people (why are they following me to the store?), cause i have cats-shadow cats (why are they lurking at my elbow all the time?), statueing out-frozen in a position for llleeenngggttthhs of time between focus/movement.
Again, Blechh.