My Son Is 28 And Has Had Grand Mal Sezures

My son is 28 and has had grand mal sezures since the age of 19. Seizures have been under control with one series of breakthroughs a year. 2016 he had his annual break through that lasted for 4 weeks. A couple of months after that he fell off of a ladder 12 ' and landed on his left foot (90 degress in wrong direction). Did not think he hit his head, 2-3 months after that he started having seizures again. They have been constant for 3 months now. Neurologist increased his meds (taking max dosage of limictal, kepra and now has added gabapentin along with anti anxiety med at night. No abnormalties in MRI, EEG. Sleep study showed he needed to see a pulmonoligist (lack of oxygen to the brain). Searching for advise/help