Morning,, and I hope you have been able to get a call into your Dr by now.. I am not a Dr, but have been dealing with my AN for three years now.. I have been just waiting and scanning mine all this time but my symptoms have worsened in the last year also so I am transitioning into surgery.. I have not read or heard of an emergency situation with these tumors as they are usually slow growing however, symptoms do seem to 'come and go" sometimes. . it is pretty obvious to me that whoever the on call Dr was that you talked to does not have any experience with these tumors/and symptoms.. as headaches are quite often reported by people on the forum. I have very sever headaches most of the time,, not always really bad,, but usually present.. balance issues and focusing issues will also influence headaches.. nausea usually comes hand in hand with the balance issues..
there are free booklets from ANA that you can get that will give you very good info about ANs and the symptoms/ issues involved. Once you see a neurotologist ,, you will get much more info about your situation I believe.. not even sure most GPs know about these things.. you may need to start with an ENT Dr... good luck and just do as much research as you can and read these posts as all of us here are going through the same things/emotions you are,, I still feel very lost and scared most of the time,, it is a VERY daunting and overwhelming "place" you have found yourself,, but you are not alone,, we are all here to help you get through this and you will,, with a little time and discussions with Dr that "know" something about these tumors,, you will feel more at ease... you can even send your MRI to several different Dr across the country who will look at it and discuss your situation with you over the phone,, One that I used is House Clinic,, or House EAr Institute in Los Angeles (HEI.com, I believe) .. they are very good Dr out there as many people on this forum will attest,, and they will discuss your situation with you "with no obligation" to go out there,, I found Dr Slattery to be very informative and a great source of knowledge and reassurance for me in my decision making,, check it out,, I think you will be comforted by their advice..
I wish you the best in your decisions and just know that you are not alone in this,, but your symptoms are not "all in your head"",,,,,,,,,,,,,,,,,, and most will be related to this new "path you find yourself on"....................