I´m having a big headache for 5 days after i made apnea in the pool only for 45 seconds.. HELP?

the pain doesn´t go away, it´s not unbearable but it´s bad… i hold my breath while moving underwater and had a sudden and terrible headache, i tought it would go away with time, but it didn´t.. would like to ear your opinions

Neuromuscular Dentists – Headache Pain – NAPSTV

MANY CHRONIC HEADACHE SUFFERERS FIND RELIEF IN AN UNEXPECTED PLACE: THEIR DENTISTʼS CHAIR. ACCORDING TO THE NATIONAL HEADACHE FOUNDATION, OVER FORTY-FIVE MILLION AMERICANS SUFFER FROM HEADACHE PAIN SEVERE ENOUGH TO SEEK HELP FROM A PHYSICIAN. APPROXIMATELY TWENTY-EIGHT MILLION SUFFER FROM MIGRAINES. IN MANY CASES, THIS PAIN IS FROM TEMPOROMANDIBULAR DISORDER, TMD, COMMONLY KNOWN AS TMJ. [...]

Headache and Sleep

Dr. Timothy M. Quast reports that the prevalence of headache disorders in patients referred to a sleep lab for sleep disordered breathing was 70%, with a higher than expected prevalence of migraine and chronic daily headache. Doug Brunk of the Global Medical News Network (GMNN) reports from an international conference of the American Thoracic Society.

2 days ago i was swimming dynamic apnea in the pool and suddenly i got a terrible headache, what can it be?

the pain is in the back and sides of he head, and it cotinues until today, but it´s less pain now. what can it be?