I have a tortiseshell who is doing the same thing...at first i thought it was because my mother had changed her food, but that wasnt it. i noticed that she didnt itch or chew as much during the cold weather. but now that the warmer weather has come she is itching and chewing more than usual. but as i've read it could be because i left for college and maybe its from anxiety/depression.She has always been a very nervous and skitsy cat though. my father says that it is psychological. but i will find out for sure tomorrow when i bring her tothe vets....also she doesnt have any swelling or bites, etc.

idk i just hope its nothing too bad