Do you have any Critical Care? If so, use some of that until you can get your bun looked at.
Teeth...
I had emergency issues with my buns last year ($1700 later) I learned there is no way to properly check their teeth unless they are put under light anesthesia. Bunnies have 28 teeth. Think of how many you can actually see on your own. Their mouths are so small!!!! It’s crazy!
Two of mine dropped weight super fast and with them being Angoras, I did not notice right away. I have an OCD groomer and she grooms herself and her brother! Turns out she had some wool block in her tummy and fortunately they were able to dissolve with medications. After a dozen sets of xrays, antibiotics, 3 medications and IV fluids, over a 10 day span in-patient, I also learned she had overgrown teeth in the back! Her brother was there with her too the whole time and he had stopped eating bc she had stopped eating! His teeth were overgrown in the back too. He ended up getting fluids and meds too.
I asked how often their teeth should be properly checked and was told every 2-3 years at the most. My bunnies were a little over 2 years old.
I’m telling ya.....I was freaked out when I realized just how much weight she dropped so quickly! Drove her over 3 hours away to a bunny specialist.
Depending on your buns age, they may need to be properly checked out on their toofies !
Keep us posted!