Due to excessive use of voice some one may feel exhausted, we referred it as Vocal Fatigue. It may occur due to misuse or abuse of voice. In addition to that if person has LPR/GERD then he/she feels dryness in his/her throat which can further damage your vocal cords and then there are chances that your voice may change.
Next Steps
Speak minimally as per requirement only.
Consult Speech therapists for voice therapy.
Health Tips
You can take steam.
Drink 4-5 lit of water every day