After running for 15 minutes, you notice severe chest pain and an ache in your left arm. For the past week, you have had a rash on your chest, but you do not feel sick. Your friend has fallen from a bicycle, is unconscious and not responding to you. What should you do?
1) Call emergency services immediately
2) Take a painkiller and rest
3) Ignore the symptoms and continue running
4) Check your friend's pulse and perform CPR if necessary