However, if these are accompanied by some more signs such as a complete inability to swallow, vomiting, skin rash, headache, and severe throat pain, then it indicates that the ailment has something more severe than an allergy, as its cause. Formation of white patches or pus on the throat, swollen tonsils, a fever over 103 degree Fahrenheit and frequent recurrence of the ailment, are some severe symptoms that might occur.