What are the side effects of dehydration and starvation in an older cat?

i have an older cat that went missing almost 3 months ago. 2 days ago he was found near death behind a neighbors house. his coordination was off and he was skin and bones. i called the vet who told me to give him some honey or karo syrup and keep him warm and bring him in in the morning. well, after being checked out we found that his liver enzymes were elevated and he was anemic. they started iv fluids on him and antibiotics. after 2 days he still is having problems with his coordination but liver enzymes are slightly improved