For the last week or so, my 3 year-old female cat has been spending
the entire day and night lying on one surface, leaving the spot only
to eliminate and eat.    She'll spend three or four days at each
location before moving on to another place.  I sealed off access to
certain parts of my living room because she would camp out there and
refuse to use her litter box (too far away? marking behavior?), opting
for the carpet instead.  This is all unusual behavior for her; she
used to be more active and would nap in multiple locations.  Also, she
used to eat more.

Question: is this normal, given the factors listed below?  Or is it
indicative of depression?  Or anemia?  Or something else?  Any advice
appreciated.

Possible Contributing Factors:
-- We moved into a new apartment six weeks ago
-- We have two new human roommates and one new adult male feline
roommate;  the human roomies are very cat-friendly; my cat and my
roommate's cat have avoided one another for six weeks; while they have
seen one another, there have been no fights or no close
interactions... it's as if they have no interest in one another
-- My cat is a rescued feral cat who has always avoided other cats
and, until recently, has never allowed anyone to pet her
-- She has been an indoor/outdoor cat since I adopted her over a year
ago; I typically let her roam the apartment complex at night, however
I've been keeping her confined to my apartment and outside deck for
the past six weeks
--  Upon moving into this new apartment, my cat got fleas; she never
had them at my old place; in fact, she didn't have fleas when I found
her living outside and she's never picked them up during her nightly
forays outdoors; now she's got many bites around her head and neck;
her scratching, however, has steadily declined in frequency

Thanks for your help.

Chris