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Common causes of difficulty in swallowing considering your case:
and stress: as you have exam, other weird symptoms, scared and fear of parasites going in brain. In such case there is spasm of throat.
-Other local pathology
These causes need to evaluated. But do not worry, it less likely due to parasites.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal