Yes, definitely give yourself permission  to call the vet as often as you need to, for help with pain control.  Be the squeaky wheel and don’t ever feel bad about it.  No two cats (or people for that matter) are the same in terms of pain tolerance, so perhaps yours just needs more. My cat is six weeks post op, and still doing daily Gabapentin for discomfort, but his comfort is really all that matters to me and my vet is super supportive.  I assume others have probably told you this, but it’s critical to stick to the pill schedule to the minute.  It’s much easier to stay ahead of pain then to try and get it calmed down.  I usually set a timer on my cell, even if it means waking up at 3am.