This is like the Fifth Time...??

So most of the time I am ok listening and learning about the body and what goes on inside of it but sometimes it makes me feel really sick. This has happened a couple times before but the first serious time was two years ago.

I was on a biology unit in school and the teacher was explaining some things when I got really quesey and my ears started to ring and I started seeing black spaces as if I was going to pass out. I didn't tell my teacher but I put my head on my desk and eventually felt better. The rest of that year I was careful to not listen when I felt myself getting sick.

Now I am in a class that talks about pregnancy and raising children. I have been perfectly fine this year until today. While we were talking about pregnancy and prenatal development, I suddenly felt myself getting sick again. Everything turned blurry, I couldn't read, I felt like I couldn't even hold myself up anymore. My whole body started sweating and while my ears weren't ringing like the last time, I could no longer hear out of my left ear. I don't know why but I tried hitting it with my left hand but my whole left side felt numb. When I felt I would be able to stand again, I went to the bathroom to regain my composure and I was fine after ten minutes.

It never happened like this where I would go numb, should I just try limiting myself more to what I hear or watch educational videos such as the lessons I was listening to so I can get myself used to hearing these things even more? It is just horrible because I love science and everything like it and these happen rarely. Do any of you guys experience something similar?