Hi There! New member with a sick piggy:-(

Hi...thanks for reading! I've done everything I can think for our 3-year old, female Guinea Pig, Coco. We went away over New Year's weekend, and when we came back...she wasn't eating, drinking, and squealing when she urinates/poops. The scariest for us is when we noticed she had blood coming out when she urinates/poops. We took her to our dog's vet, (I know, wrong vet), and he put her on Baytril. After a week, it didn't seem to be working, so we took her to an exotic pet vet. She did an x-ray and ruled out bladder stones. She said that Coco's cervix was open and it was hard to tell what was causing this. She said that it may be a uteral infection and gave her 2 weeks more of Baytril. She also gave me 'Critical Care' food to give to her with a syringe. It's been a week since this visit, and she's still not her normal self, and has lost all of her chubbiness. She will sit in her igloo all day if I don't take the igloo out of the cage or put her on the floor to walk around. She eats a little on her own, but not like she used to. Romaine lettuce, carrots, parsley, green peppers...I've tried everything! Just looking for a little advice...she's the cutest thing. Thanks again!