My neurologist would diagnose you with NF2 somatic mosaic. In other words, you have NF2 gene in some cells of the body but not all and not in the blood where it can be tested. It is impossible to say which cells are affected. Having both AN and meningioma ( any other kind of brain tumors such as glioma, astrocytoma, etc) plus peripheral neurofibromas would qualify you for NF2 diagnosis but because nothing was found in the blood, the diagnosis would be modified to NF2 somatic mosaic. There is no statistic available on how many NF2 somatic mosaics develop full blown case of NF2 and the mutation spreads to every cell of the body, but it is a possibility. Not all doctors know what it is, so try somebody who really is into it, find out in advance.
Just out of curiosity: where did you have NF2 test done?
Finally, welcome to the club: I am one, too. There have been no new developments since the initial presentation, so I am very relieved and hoping things will stay this way.
Good luck and keep us posted.