I went swimming yesterday, the water was quite cold. Swam about 20 lengths and got out of the pool. I felt normal in the pool but the moment I got out and walked towards the change rooms, I felt a sudden surge in my head and started feeling really dizzy. I leant against the wall and started having difficulty breathing. It really felt as if I was swinging from side to side and I felt like I was going to collapse. I somehow staggered to the shower and after 5 minutes in the hot shower, I felt normal again.
Why did this happen? It was really scary!