Suddenly I Have Developed Difficulty When Pronouncing Certain Words Otherwise

Suddenly I have developed difficulty when pronouncing certain words otherwise my speech is clear. I sound like i developed a lisp when pronouncing words with the letter "S' for example I did go to the dentist last friday for a cleaning I also feel like I have been sick this week i also had the flu shot last tuesday my symptoms started this monday I've had for 4 days now i had a mild headache too