The commonest causes of a cold and clammy skin are shock, heat exhaustion, anxiety attack, impending heart attack or severe pain.
Cold clammy skin can also occur just before a viral infection or can occur due to food poisoning.
Please keep an eye out for any other symptoms for at least the next 24 hours. If you have any chest pain or pain in the jaw, right hand or neck, any diarrhea or vomiting, diffiulty in breathing, dizzyness, please go to the ER.
Meanwhile drink cool water, sponge yourself down and stay in a cool place to decrease heat exhaustion of you have any.
I hope this helps.
Let me know if you need more input. If not, please click on the green"Accept" button on this page. Adding a bonus and a positive feedback will be warmly appreciated.