My 19 year old cat cant poop. HELP!

[fantc]

ok I have a 19 year old cat she will be 20 this year, and she has been two days with out going number two. it looks like it could be an impaction. I took her to the vet today and the guy stuck his finger up her butt and got some poop out. he also gave her some saline 100ml because she hasn't really been drinking water in these last two days. when I got her home from the vet she seemed fine so I went to work. wen I came back 4hrs later still no poop but now I see a little blood coming out of her butt. I can only assume its from the vets finger. also she walks funny and im not sure what to do. she wont eat the pumpkin or anything else I give her. anyone know what maybe going on with my baby?