Hi Kell - and welcome ~
Congratulations on a successful AN surgery! Delayed, post-operative facial weakness is not uncommon in AN surgical patients. I underwent a very successful AN debulking surgery but, two weeks post-op, upon close examination, my neurosurgeon said he could detect a miniscule difference from the right side and the left (AN) side of my face, that is wasn't 100% symmetrical. I asked him how symmetrical he thought it was and he replied "95%". I recall saying "I'll take it!" - and we both laughed. Even now, 5 years post-op, I can notice a v-e-r-y slight difference on the left side of my face and it is just slightly less sensitive to the touch than the other side. This is not an issue (I can shave with absolutely no problem) and is not at all noticeable. My point is that it's rare to not have even the slightest change in facial mobility post-op. So, your onset of facial weakness may be a bit disturbing (checking with your doctor is prudent) but my guess - I'm not a doctor - is that this will pass or, at the worst, not progress or become an issue. Please keep us updated. Thanks.
Jim