PMT, RB, much less of a mouthful than pre TOTM! Yes, I've found that PMT can have all sorts of strange effects from migraines to not been able to drink! Perhaps, Mrs RB, should get herself to a GP, though, to be on the safe side. I'm no doc, but does sound like some sort of blood sugar level fluctuation, possibly overload - but I have no idea. BTW, well done to her in getting round in 2:27 if she felt like that at 4 miles. Of course, she'll do Windsor!