As said above, I'd certainly be exploring all avenues.
Get your saddle looked at by a professional fitter, and at the same time, have your horse assessed by either a vet or an equine physio.
Don't try to ride until your horse is feeling 100% and is lunging sound.
Buting just to ride is going to cause more problems, if you sprain your ankle and keep walking on it with painkillers, there's a very high chance of doing further, more permanent damage. Same goes for horses.