Hi, Klynn ~
Welcome to the ANA discussion forums.
As previous posts indicate, there really isn't a template for what is a 'normal' post-operative recovery following AN removal surgery. The use of steroids has differing effects on each AN post-op patient but the admittedly vague comment from your father that he "doesn't feel right" could be associated with the effects of the steroids - as well as the physical trauma of a serious cranial surgery that probably lasted for hours.
I was 63 and in good general health when I underwent my 9-hour debulking surgery (4 years ago). I slept for most of the first 2 days immediately following my surgery but I was sitting in a chair by the third day, walking the halls by the fourth day and discharged on the morning of my fifth post-surgery day. This is fairly typical. However, I didn't feel anywhere near 'normal' until a few weeks following the surgery.
As Clarice ('CHD63') stated in her message, your father is in good hands with Dr. Brackmann at HEI. I'm sure he'll be happy to address any issues that may affect your father's recovery.
I'm pleased to learn that the forums have been helpful to both you and your father. I hope (and will pray) that his recovery progresses nicely, with no complications.
Jim