One-off photosensitive episode

 Hi, I´m 16 years old and had a seizure in a party I hosted around 8 months ago. It could have happened due to a combination of things including the intense strobe lights and thick smoke, I was also lightheaded due to cigarettes. The lights were my own and I have carried on using them but have not had another seizure when exposed to strobe lights in parties or other venues since.

 I went for a MRI scan the night I had it, the results were negative and I was told there was nothing wrong with me. Does anyone know what this was and if it was just a one-off thing?