Hello and welcome to the forum, although I am sorry you had to find us under these circumstances.
Unless I missed other posts, could you provide us with more information on the size of your AN? From what you mentioned you had GK a few months ago. Did you have the symptoms you are describing prior to GK, or did they appear afterwards? It is very likely that you are experiencing some swelling, which is very common during the first 6 months post radiation. Have you had a follow up MRI yet? If not you certainly should. If there is swelling, this may explain your intense symptoms - sometimes a course of steroids helps.
The sense of taste is due to the trigeminal nerve being affected. It may have been irritated from the radiation, or affected directly by the AN.
I think it would be a good idea to contact your radiation oncologist right away to consult with him/her. In any case, I don't think it is advisable to rush into surgery at such short interval after radiation, unless there are serious swelling problems, causing hydrocephalus etc. This is extremely rare. It can be a very rough ride for the first few months, but things usually do get better. I would advise you to read Francesco's story (fbarbera).
Best regards,
Marianna