I understand. Instead of singing worship music, can you just listen to it? Would that make things better? Listening may wash out the racing thoughts and help you worry less about the devil etc.. Plus, you can have the music on in the background while you do other things. Then you aren't getting so annoyed with having to sing all the time. You're basically letting someone else "do the singing for you," if you see what I mean.

I'm sure these feelings will pass soon. You're doing the right thing by talking to your pdoc. Keep doing whatever keeps you safe until you feel better.