Seizure/epillepsy. Gaanja/marijuana.

My brother came home at 7 pm and while he unbuttoned his shirts he suddenly started shaking vigorously and fell on the bed and continued shaking for about 2-3 mins while on bed. It felt like his whole body was vibrating and eyes sort of pop out. My mother who first saw him started weeping at d sight of it. I held my brother nd started rubbing his back and dint knew what to do further. After some time he stopped shaking but was apparently weak. He vomited twice after that. I took him to the nearest hospital wer BP, heart rate, blood sugar wer checked and were reportedly normal. On being questioned he said it was the first attack. He is due for a ct scan but the doctors said the symptoms were consistent with fits. I was very scared of that sight and wanted to know what this was and looked up on Internet and it scared me even more where seeing many people were stating medicines may or may not help . On enquiring his room I found some suspicious thing like gaanja/marijuana.