Hi, Thanks for using healthcare magic. I feel eating slate pencils is your reaction to the stress. You should also rule out hemoglobin and calcium deficit. You should go for counselling or psychotherapy regarding how to handle stress. Counselor may advise you to do time management ans relaxation therapy like yoga, meditation and breathing exercise. You can also do stress management in which you need to observe your mis- conceptional thoughts and try to rectify it with generating alternative thoughts and behavior. If not controlled, you can take help of psychiatrist. Thanks.