I am training to become a lifeguard, so I swim every day, and never had any problem. On Monday, as I was swimming underwater (always been the easiest part for me), I got a terrible headache on the back of my head, and it lasted for 24h . I took one day off, and when I returned to the swimming pool, the minute I tried to swim underwater , the headache came back, even stronger, and I had to go back to the surface.
Any suggestions? Please don?t tell me ?stop swimming underwater?, as it is part of the job.
Thanks in advance, I am quite worried