My 5 year old mini Rex, Essie, has recently starting acting weird about peeing and pooping. She'll get in her potty and then leans her legs up and pees really high. Like almost over the guard high. Why on earth would she be doing this? Also she pees in the cage floor, she doesn't usually do that, though she is a messy bunny. And also recently she has been pooping everywhere in her cage. 

She doesn't seem to be in pain, but I can't really tell. What do I do about one if it is? No, they are not bonded. I nearly lost my mind trying and finally gave up. 

Do the vets charge outrageously for testing the urine and the meds? I mean in general.