A viral illness together with the medicines used to treat it, plus long hours of studying, can irritate the stomach and gut at the same time, which fits what you're describing. Burning and reflux reaching your throat that hasn't settled on Pantoprazole and Eno means the current approach needs reviewing rather than more of the same. The urgency after eating, especially with potatoes, points to your gut being temporarily more sensitive after the illness.
Next Steps
Eat smaller, more frequent meals and cut back on spicy, fried or caffeinated food while this settles, and avoid lying down right after eating. See a physician or gastroenterologist if the burning carries on beyond another week, since your current medicines may need adjusting or a stomach workup may help.
Health Tips
Get checked sooner if you notice blood in your stool or vomit, unintentional weight loss, or pain that becomes severe.