palpitations, pounding heart, or accelerated heart rate
sweating
trembling or shaking
sensations of shortness of breath or smothering
feeling of choking
chest pain or discomfort
nausea or abdominal distress
feeling dizzy, unsteady, lightheaded, or faint
derealization (feelings of unreality) or depersonalization (being detached from oneself)
fear of losing control or going crazy
fear of dying
paresthesias (numbness or tingling sensations)
chills or hot flushes

Your not alone. Breathe deep, close your eyes and exhale slowly. Continue to do this until the feeling passes. Take care.