Hi Kain,
like everyone else has said, symptoms can vary vastly from one patient to another. I am among the percentage that didn't have any hearing loss or imbalance upon diagnosis - only numbness in the face. This is associated to the trigeminal nerve being impacted - the result can be from mild hypoesthesia (numbness), to the feeling of "pressure" that you describe, and sometimes a "burning" or "tightness" sensation. I have experienced all these from time to time. As for the imbalance, many times the destruction of the vestibular nerve is so slow, that the other side compensates without the patient ever knowing it. Generally small tumours located entirely in the Internal Auditory canal may cause more symptoms than larger ones, located on the CPA.
It does seem like your doctors have put you in W&W status. This is very common in many countries like Canada and in Europe, where they are very conservative in the choice of treatment. The logic being that if you are not experiencing serious symptoms, you are better off leaving the AN alone, because you will be probably worse off after treatment anyway. Based on this approach, the recommended course of action is to have MRIs at 6 months intervals, to establish if there is a growth pattern - if not then you don't do anything.
Also, your doctors are to some extent right when saying that they cannot for sure establish a link between the AN and your symptoms. For example headaches can be caused by many other factors, and generally they are not a typical symptom of an AN. Also the sensation in your face is a bit odd given the size of your AN - usually it happens with larger ANs, that reach the brainstem.
I would say that first of all, you need another MRI at a 6 month interval (sooner would probably be useless), to establish if there is any growth. On the issue of contrast, while it is indeed established that gadolinium contrast is the best way to diagnose an AN, sometimes in the most modern and sensitive machines it is not necessary, once the AN has been detected (which is your case). I know of many patients in Toronto that didn't have all their MRIs with contrast - just the ones that were intended for treatment planning. In the meantime, research, research, research, so that you know what is the best option for you once the time comes to decide. Your AN is still very small, so you have plenty of time.
Good luck
Marianna