[clockworkdog]

Originally Posted by MarkP

OK, this needs to be read in the knowledge that I know pretty much nothing:

1) Post (and mid)-dive headaches often seem to be related to CO2 build up. Shallow breathing and / or poorly performing regs can lead to this. Slow, deep breathing should be a cure on its own.

2) Migraines are another matter. There is circumstantial evidence linking migraine with aura (visual disturbances) with PFOs. PFOs are linked to unexplained bends.

So, in light of the above, a PFO check might be a good call and save you a bend. See a diving doc.

An alternative similar defect is an ASD (Atrial Septal Defect) - there is a third similar one but read about those two. Treatments are similar - I personally know two people who have had these dealt with.

Might be nothing to do with these but if I were you I would dive on nitrox and stay conservative (depth and dive as though you were on 21%). The other reason to get this possibility looked into is that PFO's and ASD's are linked with migraines and strokes (or brain attacks).

I know a good diving doctor in London if you need one - he works out of Harley Street.

Cheers

Andy