RIs dont go away unless treated the right way. The vet shouldnt of given you 3 shots of 3 different meds to give all in 3 days. Most meds are given once every 3 days for 2 weeks. If that dont work you wait aother 2-3 weeks before starting a new series of shots.
I agree.. My exotics vet saved one of my snakes life as a baby but she had to go back multiple times within a weeks time for multiple injections. It worked and she's never been sick since.