For heaven's sake, give it a break. Calm down and let your vocal cords calm down too.

Now, think about the simplest remedy possible - next to remaining calm. Feed the cords some honey. Do not try to sing at all for at least 24 hours. Accept this as a vacation, not a crisis.

Now, I am sure there are mudcatter's out there who have had this problem and will respond with some simple ideas - rather than go to a doctor. Clearly you strained something. If you strain a muscle, what do you do? Nope, you cannot rub something on your vocal cords but you can give them soothing honey, herbs? healing teas?

Just calm down. Listen to soothing music. Give them time to heal.