Firstly, you would likely be in complete darkness and unable to breathe since the esophagus would be tightly constricted around you, preventing air from entering your lungs. The muscular contractions of the esophagus would propel you down towards the stomach.
Once you arrived in the stomach, the acidic environment would likely cause irritation and damage to your skin and respiratory system, which could lead to respiratory failure. You would be exposed to powerful digestive enzymes that would begin to break down your body, potentially causing significant pain and discomfort.
If you managed to survive this stage, you would eventually pass through the small intestine, where the nutrients from your body would be absorbed into the bloodstream, but unfortunately, as a tiny human being, you would not be able to provide sufficient nutrients to sustain the body.
Ultimately, being swallowed whole by a human being would be a traumatic and potentially fatal experience. It is important to remember that this scenario is purely hypothetical, and no one should attempt to swallow another person or engage in dangerous or harmful behavior.