As per your history the main reason is your job profile and also seems like allergic component to it. Some investigations may also be required to know the exact cause.
Next Steps
consider online consultation for detailed history or meet any ENT specialist for examination of your larynx.
Health Tips
Take voice rest for 1 week.
Take Tab.Allegra-M once a day and Cap.zevit once a day.
zytee lotion for local application on Ulcers.