i have had a catscan and MRI on my brain and the results showed 2 airpockets one on either side of my brain 5mm by 7mm in diameter. a complete blood work up was done and everything from cholestrol, sugar iron everything is within normal range. my blood pressure is 145/115 when not on perindopil i have occasionally nausea and vomitting and worst of all i have headaches range from .5/10 to 8/10. i have an overweight problem . my doctor said to loose the weight and the bp should come down. i have never had high blood pressure except with 2/3 of my pregnancies otherwise it was always low. can hitting your head twice on the edge of a pool cause these air pockets and are the air pockets causing the headaches?i swim 60 laps everyday and during those laps i turn on my back and swim a couple of laps on my back . sometimes i forget to watch where i'm swimming and bump into the edge of the pool. so its only a 'tap'.i dont usually have headaches but they started about 4 months ago....... are air pockets dangerous. what should be done. can the air pockets get bigger if i keep hitting my head by other means.