Hi, I Had A Random Episode Where I Felt Very

Hi, I had a random episode where I felt very lightheaded, had a heat flash and started sweating, then noticed hearing in my left ear was muffled and then both ears sounded muffled, and started having tunnel vision, I felt as if I were going to faint. I currently take vyvanse 30 mg and have not had anything to eat except some mint lifesavers, some iced coffee and some Arnold Palmer. I'm a 21 year old female, weight 110lbs,
I understand I had eaten poorly today once I had the episode, but if this were to happen in the future is it due to hypotension or low blood glucose levels?