Hi and welcome to the forum
I'm sorry to hear you have an AN, but you've come to a great place for support, advice, and comaraderie.
Patients diagnosed with ANs seem to have a list of similar symptoms that are common, but not everyone experiences the same things. What I'm trying to say is hearing loss, balance issues, headaches, vertigo, etc., are all symptoms of an AN, but not everyone who is diagnosed with an AN has all these symptoms.
In my case, I had diminished hearing and a feeling of fullness in my AN ear, but no headaches. I also didn't notice any balance issues until my neurotologist tested my balance.
But everyone's AN journey is different and even though I didn't have headaches doesn't mean that other AN patients didn't.
Ironically AN size doesn't seem to go hand in hand with symptoms or the severity of symtoms; so a 3 mm AN causing symptoms isn't uncommon. Sometimes small ANs cause big symptoms; sometimes large ANs cause small symptoms.