Hi Joy and welcome to this forum. Sorry you had to find us by way of an AN diagnosis, but glad you did find us. This is a supportive, caring group who will walk with you on this journey ..... sharing what we can from our own personal experiences.
You did not say if these internal tremors came on at the same time as the nausea and dizziness. If so, I am presuming you have shared this symptom information with your doctors, as well. Depending upon exactly where your AN is growing, many different symptoms can present themselves.
I personally did not have this symptom of internal muscle tremors, although initially I had very strange, almost surreal, feelings internally. My doctors (and I) attributed it to the stress and anxiety after diagnosis, but before treatment. After surgery, I no longer had those feelings.
You should definitely tell your doctor(s) about all of your symptoms to determine any connection to the AN.
What is the size of your AN and where does the MRI report say it is located (in the canal, outside the canal, near the brainstem, etc.)? How long have you had symptoms?
Ask away with any more questions and let us know how you are doing.
Clarice