Has he performed anywhere since he dropped his album? I think maybe The Voice once, or did he cancel that too?
I understand anxiety being an issue, but when you're a singer, you need to either a. be medicated if you can't handle the stress, b. talk to someone about it and be getting regular help for it, or c. do not become a singer in the first place.
This isn't exactly new to him, being in front of lots of crowds.