I have a 7 year old Boer doe who can't seem to get well. She continues to get diarrhea. I have given her several different wormers.. ivermectin, safe guard & another one my vet gave me (forgot the name). I've also given her iron & I've sprayed her to stop the bugs. She looks so run down. I just don't know what to do anymore to help her. I'm scared I'm going to lose her. What do you think could be wrong? What do I need to give her? She is the only one in our herd that is like this, we have a doe that is 12 years old that is healthier than she is.