I'd hate to see you not posting Laura.
I might be missing something, but I can't see that this is a reason to stop coming here.
If you remain really worried about a possible breach - PM a mod to change your screen name, make sure you don't have an automatically entered password (enter it manually every time) and, like NB says, clear your cookies your history and your cache after every visit.
I hope you find a way around this.
D