I had the left side if my thyroid out in 07'...I still have my blood drawn to make sure my thyroid levels r ok...everytime I have to up my does by about 25 mcg(about evy 6 months). B12 was something that was low on my last blood test...my Dr said by taking more B12 could really help me feel better.
Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to obtain a history from you and examine you, I can not comment on a formal diagnosis or treatment plan for your symptom. However, I will try to provide you with some information regarding this matter.
I am not sure if seeing a neurologist is what you need. You probably should see an endocrinologist. A complication of removing the thyroid is disruption/removal of the parathyroids. This can lead to calcium fluctuations (particularly low calcium), which can cause twitching of the face and other body areas.
Thank you for using the forum, I hope you find this information useful, good luck.