Hello, I Am Training In Classical Singing And For A

Hello, i am training in classical singing and for a few weeks now i have been noticing some changes in my singing. It is very breathy and i am unable to sing the higher notes that i used to be able to sing. I tied resting vocally but that has been helping very slowly. Nothing hurts in my throst so i am very confused, at first i thought it was that my vocal chords were swollen from so much singing but its alreafy been a month and i see no improvement. Please let me know of any home remedies or medication.