Unless you are on a diet, you should lose weight so quickly, lest fainting affect your performance on the spot.

Be confident. When looking for a job, pay more attention to your adaptability and practical work ability. Don't lose big because of small things.

Now you can control some diet properly, strengthen some exercise, and don't go to extremes.

Arm your mind, adjust your mood, put on appropriate clothes, show some confidence and calmness, and fully show yourself.