Hello! My name is Dr. Aida and I am glad to attend you on Healthcaremagic! Your symptoms could be related to an inner ear disorder. The difficulty in spelling the words, could be related to your brain damage, due to the surgery. Anyway, I would recommend performing an EEG to exclude partial seizures and consulting with an ENT specialist for a physical exam and performing labyrinthine tests (to investigate for an inner ear disorder). Hope you will find this answer helpful! Best wishes!