My Cat is Acting Odd?

the vet already told you what the problem is--she is in renal failure-her kidneys are not working--this would cause all of the symptoms you are seeing and more--she is probably not getting enough nutrients and is losing fur because of it---hair happen to every cat pretty much-but if she is losing fur-well half of it is going down her throat---do a google search for feline crf-educate yourself about the condition and treatments--yahoo has an awesome feline crf group--they are more educated than a lot of vets about the condition...with treatment you can see major improvement-