Discussion About Dont know

I have difficulty in eating and drinking cuz whenever i eat, after a few bites I have difficulty in swallowing food like I feel tightness in chest and shortness of breath like I take deep breaths while eating and I fear while swallowing food as if it might block my trachea or I would choke. Last year, I gave my exams and during my exams I took too much stress and didnt eat anything (eating very little whole day or even just bites of food due to exam stress). After that, I encountered somehow same issue as I developed nausea which interfered with swallowing so I feared swallowing. This time, when I gave my exams, I am encountering the situation I told you. What can be this thing and what measures should I take?