Nimhans is one of the best institute in India... Its better you consult them again...First and important part is compliance because most of the convulsion comes while missing doses of medicine. Secondly stress like missing meal/not getting sleep/ visual photic stimulation like lights directly coming to eyes (like in dance party/laser show), psychological stress etc can precipitate the convulsion. Recent increase in weight can also reduce drug level in body and precipitate convulsion...