it's also that time of year for the "itchy boogies"....I read somewhere that October is the worst month for fleas.
I have one gal that has an extreme flea allergy- they need only walk across her and she is sent into a frenzy of itching, scratching, licking, chewing....It is most detectable by the scabs her itching terror leaves behind.
Treated with flea application between shoulder blades- completely GONE.
I have another that chewed her hair for years and nothing I did helped ( changed diet, flea meds, etc) until she became epileptic and started on phenobarb....she now has a full body of hair and is perfectly "fine"....In her case I think it was a behavior issue that a little narcotic calmed her and straightened her out.
In one last case, I have one that is naked all down the underneath and after much working with her, have determined that hers is also behavior, but is not extreme so no meds needed...she doesn't pull frantically or for hours on end, she just keeps her belly hair short when she grooms..
Yours could be an allergy to foods ( fish, beef, grains) and you could eliminate one at a time to see if that helps...could be the flea allergy and flea meds would help that...could be seasonal with the pollens and mildews and need antihitimine or could be behavioral and needs meds.
In my house it would be process of elimination b/c I can't afford the vet bills, but if you have the budget, it might be helpful to do an allergy panel?
Hope it works out well soon.