Neuro or Psychological. Is it fnd?

I am 35 yrs old female. Under treatment for ankylosing spondylitis and seronegative arithritis for the past 2 yrs.  1 yr back I had an episode of eyebrows drooping n lips drooping, unable to move them,  blood tests l l n brain MRI were done, results came negative, I was told it's bcoz of migraine. I started taking topiramate as advised. But I kept having these episodes, until this April, where along with eyebrow drooping, I had jaw locking, lips drooping, brain MRI and blood tests including  were done, everything is normal. Since then everyday this would happen,generally in evening. In May another episode happened, where additionally I had temporary limbs paralysis for 6 - 8 hrs, intermittent tight squeezing of upper body, rigidity n involuntary movements of hands n toes. Chest n Abdomen CECT, AchR, RNST, b12 tests came out normal. I have been told it's not neurological, rather psychological (FND). I have started taking etizolam 0.25 mg SOS, but I find no relief in symptoms. is it FND?