By the end of my rehearsals, I feel hoarse and nearly lose my voice. How can I fix this problem?
If you are feeling hoarse and experiencing a change in your voice after singing, it is likely that you are not singing properly. Prolonged or frequent improper use of the voice can lead to serious damage, and it is important that you change your bad habits now. Seek the medical advice of a doctor and the instruction of a good vocal technique instructor, preferably one who has experience working on the rehabilitation side of vocal training.
Additionally, read my article on this site on Vocal Care to learn about ways in which you can proactively protect your voice.