unfortunately years of diving without problem does not necessarily mean you don't have a PFO. A friend of mine has been scuba diving full time for 10 years, got bent last year and has just found out he has a 1cm PFO.
Your symptoms do sound a lot like some of the symptoms I had with DCS last year - and sometimes still get after lots of freediving. Hydration seems to make the greatest difference to me together with longer surface intervals (Doc advised 10mins, I usually work with around 6 min)
best of luck
Sam
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