man i get Toxic stuck in my head all the time. and the thing is, i can't stand that song. but that screeching part gets stuck in my head and wont leave.
i always seem to have a song stuck in my head, so once i tire of that song i listen to something different, and have it stuck in my head. so i kinda rotate i guess u could say. hehe.
i also associate songs w/ ladies. for instance, i think of "Spooky" by Atlanta Rhthym Section whenever i talk to a particular girl. so i have a mixture of songs in my head all the time, some happy, some sad.
haha i also have pink floyd stuck in my head often, "Money" in particular.
my cure is just to listen to something different.