My cat is really sick. Wont eat or drink anything.?

Your cat has a gastrointestinal blockage problem. Depending on the breed this could be serious and this could kill the cat. Have you noticed any bloating in the belly? Is it possible that the cat had eaten something that would not p? Plastic...metal...anything that you left laying around? It could be anything. I've seen this before...and the cat died. If you care about the cat then get the work done. Otherwise get rid of the cat.