Final answer:
In this situation, the next action should be to load the patient into the ambulance and transport him to the hospital.
Step-by-step explanation:
In this situation, since the patient's symptoms have improved after receiving epinephrine via auto-injector, the next action should be to load him into the ambulance and transport him to the hospital.
This is important because anaphylaxis is a severe allergic reaction that can be life-threatening. Even though the patient may have a temporary improvement, there is still a risk of the reaction returning or worsening, so it's crucial to receive further medical evaluation and treatment at the hospital.
Record the time and dose of the injection on the run form should also be done, but it is not the next immediate action in this situation.