Best option is to keep your bird as well as possible until you see the vet tomorrow. He will examine your bird and can learn things that a person not a vet can find. Also, to tell the vet the best you can see about how bird has been feeling and whatever else may be helpful.
I have red enough on birds to get the problem about half right. The vet always notice things with my birds that I was unaware of. I hopr you have a good vet that you are comfortable with.