Hello, I recently got cast in the role of Katisha in the Mikado. The fun part? I'm a baritone. I found out when auditions were happening that I could hit the F5 required for the part in falsetto, so I tried out and was cast in the role. However, as rehearsals have gone on, my falsetto has gotten weaker and weaker, and in fact my range in chest voice has suffered as well. I think I might be straining my voice too much, though when I'm fully warmed up and singing it feels fine. Today, I can't sing any falsetto at all. I don't know if I just need to rest my voice for a while, or if I need to drop the part. I'm not experiencing any pain, but I'm really worried that I might be damaging my voice, because I definitely have much less stamina in falsetto.