My 6 year old had a very, very painful leg cramp a few nights ago - I called the pediatrician and she thought that it was a general muscle cramp, not related to growing that could be the result of dehydration or lack of potassium.
Oh Brandi I"m so sorry you are going through this.
Nail Biting is a sign of stress and I'm sure it is a reaction to that. Is there a School Counselor or teacher you can speak with to address the problem with the other kids. It sounds like a bully situation!
Click below for an article about nail biting. However, I think addressing the social problems at school will be an important start.
If your child develops certain symptoms, it's wise to notify your child's doctor. Worrisome symptoms that might indicate that something other than growing pains and something more serious may be going on include:
Persistent pain, pain in the morning or swelling, tenderness, and redness in a joint