My cat has been lethargic and anorexic; he vomits about every other
day.

His feces often times (not always) smell like feces and vomit, they
have a very heavy, dull, pungent smell (this is recent) - sometimes
they are formed and sometimes they aren't. His coat seems scruffier
than usual.

He doesn't want to eat or drink much, but will do both sometimes,
especially after having a Prednisone (which was a last resport to get
him to eat and drink).

He is losing weight and has been on 5mg of Prednisone for about 2
weeks. The vet has done lab work; the lab work comes back normal and
within range execpt for the ALT (liver enzyme maybe) was very slightly
elevated, but the Dr. said that wasn't diagnostic.

Our cat Mike is a 10 year old DSH and we love him so much. He is
mostly indoor but does go outside for short outings daily. He cries
inconsolably a lot and seems to not want to jump like he used to.

He will still purr at times, he sleeps more than usual for him. We
don't know what to do and are so worried; can anybody suggest anything?
We're thinking the next steps may be an MRI or Ultrasound but they are
so expensive and we have already spent a lot of money trying to get
diagnosed and the vet (who has been a good vet) doesn't seem to be able
to figure it out yet.

We love him so much; he is our best friend - if you have any
suggestion, please, please, please post here or email us - it would be
greatly appreciated. All I want for the Holidays is to know what is
wrong with my Mike-y cat.