Something at the gym

I'm confused by something that happened to me yesterday and I wanted some opinions on it. I had a fitness evaluation at the gym yesterday. Before the evaluation, I knew I was having trouble. While I was waiting, I was sitting in the waiting area and I suddenly found myself transfixed by the tiles. Specifically, the patterns in the tiles leapt out at me. They started "moving", and suddenly, it looked like the tiles were bubbling up through the middle of the pattern in one tile. It started to make my head hurt, so I forced myself to look at the door, which is a less "complex" pattern. I went for my evaluation, and I warned the fitness instructor that I was seeing the doctor for "moments" that might be mild seizures, and that I was extremely spacey tonight, so if I had to pause and close my eyes, not to be alarmed. Halfway through the evaluation, I had to stop. I was doing an endurance exercise to see how long I could support the weight of my body. I was standing on the carpet, and I began to get dizzy. It wasn't an exertion dizziness, though. I know that feeling (as I tend to overexert myself), and it was different. The carpet had a very complex pattern and suddenly I realized I was staring at it and couldn't pull my eyes away. I couldn't support my own weight anymore and sunk to the ground and sat for a minute with my knees to my chest. I was suddenly aware that the instructor was calling my name and asking me if I was okay. The carpet was moving, and I think I said something to that effect. Then I realized if I closed my eyes, I could make the carpet stop moving, so I did. I felt like I was floating for a minute or two. He was calling my name and telling me to stay with him. I managed to put my finger up, which is my sign to my husband that I need a minute, but my husband was not there. The instructor didn't know that I was alright. I managed to tell him that I was okay, and after taking a few deep breaths, managed to get up and get some water. I finished the evaluation with no problem and managed to convince the instructor that I really was alright. I just want to know, does anyone else find complex patterns trigger them? It had already been a bad day and I was feeling extremely down yesterday. On days like this, I find looking at faces difficult. I met with my friend for coffee last night, and while I could look at her nose, it was difficult to look at her eyes. It made my head hurt and my nose feel twitchy.