Please call 911 immediately if you are having chest pain, difficulty breathing, severe bleeding, sudden weakness or numbness, or if you think you have a medical emergency.
While waiting for help, if the person is not breathing, give CPR:
If the person has pale and clammy skin, glazed eyes, sweating, rapid and shallow breathing, weakness, dizziness, or vomiting:
At the hospital, the next steps depend on the particular case.
WebMD Medical Reference