First, what post in these forums ISN'T strange?... :)
I've read before that you have pin worms. Do you think you still have them?
I have pins that seem to be resistant to everything so far and I've tried a LOT of different natural remedies and lots of Vermox. These things are not only crawling out my butt but my vag and urethra. The whole area gets itchy and irritated if I am having an allergic reaction.
A suggestion would be to take anti-histamines for a few days to see if that resolves the irritation. If not then you can at least rule out allergies.