that diving incident may have caused a traumatic rupture of your eardrum. now when you get water in your ear it is causing pain perhaps because this rupture/hole is still open. the only way to confirm this possibility and to provide you with some appropriate treatment would be for you to see a medical professional specifically an ent specialist.
water in ear extremely painful causes disorientation and sever headaches. when i get water in my ear its stuck there for days. it is very painful and causes very bad headaches. i become disoriented and lose balance i'm tired of wonder what the issue is. it all started after an exact incident i dove into the water and instantly was in pain couldn't tell which way was up and immediately had a headache. later on there seemed to be a bit of dry blood in my inner ear. any input would help! thanks