These are new words used in the dialogue. Try to memorize them.
1. 食べすぎる to eat too much 2. 言わないで下さい Please don't say it. 3. 上(あ)がっちゃう to go up/rise (completely; beyond one's control) [= あがってしまう] 4. そんなこと that kind of thing/fact 5. しんぱいしないで下さい Please don't worry.