Hi, i hope after your surgery the corrections are made and you are keeping right posture during your work or studies. Here are few more reasons which can cause this problem. 1.Adrenal gland insufficiency 2.Thyroid gland disorders 3.Blood sugar instability 4.Sex hormone imbalances (estrogen and progesterone) 4.InfectionsInflammation 5.Micro mineral imbalances such as magnesium 6.Candia (yeast) overgrowth 7.Parasitic or bacterial overgrowth 8.Neurotransmitter imbalances 9.Mitochondrial disorders 10.Tumours or space occupying lesions of the brain These reasons are generally not taken into account. Get these things parameters checked and fix the imbalance if any.