Treatment will depend on your symptoms, age, and general health. It will also depend on how severe the condition is.
There currently aren't any medicines available that effectively treat rumination syndrome. The best way to stop it is to relearn how to eat and digest food correctly. This requires diaphragmatic breathing training.
A behavioral psychologist often teaches this, and it's easy to learn. The method has to be used at the start of every meal to avoid regurgitation. Over time, most people can master the breathing method. This will stop the bad symptoms of rumination syndrome.