It’s pretty normal to happen even when you are just speaking loudly for an extended time. Singing can be a lot more taxing than just loud speaking. Singers have issues with their throats all the time because of that. Here’s one article I found on the subject, but there’s lot of material online: https://www.centerforvocalhealth.com/vocal-health-and-care/throat-pain-with-speaking-and-singing-am-i-injured