My cat has not been eating much for the past few weeks... and yesterday she started throwing up and falling over so I took her to the vet... all the tests come back normal to average for an older cat which she is.. but her blood sugar is really low (she's diabetic) and the vet thinks that she might have cancer... but its hard to diagnose cancer in animals... he did say that weather its cancer or not something is really wrong with her.. she's lost 2 pounds since November when she was last in to see the vet.. which is very bad for cats... the vet gave me some medicine that will help settle her tummy so she can eat (in case she has and upset tummy and thats why she hasn't been eating) but does not think that it will help much.. the tests that I'd have to put her through to determine what is wrong cost a lot and may just end up prolonging her suffering.. so I may just have to put her to sleep.. *sigh* I don't want her to suffer..
Edit: We had to put her to sleep the week after my son was born (April 13th)