Where did you have the twitches for four months? Only on the left cheek? How long have you been on the medications? Does anything make it better or worse? How tall are you? How much do you weight? Any weight change? Any other symptoms? Any medical problems? Any surgeries? Any other medications? Any family medical history?
Are the twitches consistent?
It is very important to tell me you always have it or it comes and goes.
It seems to be due to anxiety or anxiety from the side effect of xanax and klonopin. You should try selective serotonin reuptake inhibitors (SSRIs) or serotonin norepinephrine reuptake inhibitors (SNRIs). If they don't work, you should try tricyclic antidepressants (TCAs) or pregabalin. However, it will take 4-6 weeks that SSRI or SNRI takes effect. Benzodiazepines such as xanax and klonopin paradoxically cause anxiety after the long-term use. They should have been used by 5 weeks till SSRI or SNRI kicks in. You should taper the dose gradually with your psychiatrist. The sudden stop causes severe withdrawal symptoms which could last during the rest of your life.