Hi. I really need some guidance. I have to cats, sisters named Bloom &
Camoo. Bloom is a happy cat in every way. Cammo is not happy at all and
I don't know what I can do to improve life for her.

To keep it brief, I'll bullet point:

* she vomits all dry food (dry is all her sister wants or needs)
* she hates her wet food. eats it only after letting it sit for half
the day or more and never the whole serving (medium can)
* she is hungry all the time. cries all day for food. won't eat the
food in her bowl.
* I switch wet food brands constantly. she likes the new brand for two,
maybe three days. gobbles it up. then we're back to not eating and
crying for something else--not playing games for attention but really
crying and really hungry. I don't know what to do!
* she poops in her box (she has her own box which is always fresh and
clean) only 1/2 the time. the other half it goes on the carpet
* she cries and jumps up & down all over me and the furniture to let me
know she has to go potty, but won't go in her box even when I put her
in it. She won't go outside in the little patch of ground in the yard
where there is flowers and grass either. she freaks out, runs to a
corner somewhere in the house, and lets it go there. the vet says she
is not suffering from worms or constipation
* she is starved for attention (a metaphor for everything about this
cat: starved), throwing herself at my hand or into my leg, mooshing her
head into my cheek, her nose into my ear. it's quite adorable, but it
is never really satisfying for her I don't think as she never really
calms down
* all night long, many times almost every night, she becomes frightened
by some tiny sound and bolts from the bed.  she bounds back up onto the
bed a few minutes later, but this is a little disconcerting because she
wakes me and her sister cat and then we are all stirring and the next
thing you know my light is on and I'm reading when I should be sleeping
* she is almost never content, but she's almost always purring!
furiously and loudly

I'm not too keen on the idea of antidepressants for animasl, tho it has
been suggested by a friend of mine (the vet isn't too keen on it either
but said she would prescribe if I said that's what I wanted). I'd like
to leave that as a last resort. Perhaps some of you know of natural
ways of boosting a cat's sense of well being?

Both of these cats are eight-years-old and have been with me since they
were 16 week old kittens. Before that they were with a good friend of
mine who discovered she was allergic to cat dander. Before that the
were in the pound, having been rescued from a Dumpster: someone left
them there inside an old soap box. I want to be the best human mom I
can be to these animals but I fear I'm failing Camoo. Recommendations
earnestly sought!