It seems you might be referring to "acid reflux" or "gastroesophageal reflux disease" (GERD), which occurs when stomach acid flows back into the esophagus. While acid reflux itself doesn’t directly affect the body’s nerves in a way that would cause you to sit up slowly, there can be secondary effects that might influence your overall physical response, such as discomfort or pain.
The discomfort from acid reflux can lead to changes in posture or movement as individuals might want to avoid exacerbating their symptoms. If you are experiencing a sensation of sitting up slowly, it could be due to a protective instinct against pain, discomfort, or other related issues.
If you're experiencing significant symptoms or changes in way you feel, it's best to consult a healthcare professional for personalized advice and diagnosis.