What Causes Difficulty In Swallowing?

I am having difficulty swallowing. I took an antibiotic about 2 hours ago and woke up an hour later with difficulty swallowing. I have tried eating (corn tortillas), drinking (almost 3 bottles of water and a cup of hot chia tea in an hour). Nothing is helping. There is pain swallowing; the larger the amount swallowed, the greater the pain. Burping does not help either; it tends to make the pain worse. There is no numbness or tingling in my extremities.