Thanks for the replies!
That DAN article is very interesting, seems that all the divers who had problems with the pseudoephedrine also had some other contributing factor.
So after reading this I'm going to set my PO2 to 1.3 which gives me a maximum depth of 34.9m on 28% nitrox. More than sufficient on my first boat dives of the year
. Might even see one or two of the scallops that Woz missed!
Chas49, thanks, I'm not ignoring reverse block but it could equally happen if I don't take decongestants and fluid moves about during the dive.
Thanks again,
Susan.