I always get this with trips, even fairly minor ones... and I do find that Halloween always sets me off very badly. I don't know whether it's the superstitions surrounding this time of year, or if there really is something in the air (actually, I'm pretty sure that's part of it, and I can feel it creeping up a few days in advance) but I do get very stressed on this night.

Which when you think of it is sad, because it started off as a Christian celebration of light and life to honour one's ancestors. What happened to apple bobbing!

Anyway, I really hope you're feeling better soon.