You are right you are extremely stressed out. You need to break this cycle of worries immediately.
Do what ever it takes, go out with friends(who are not stressed out because of exams.)
Go for a long walk. Get some fresh air in your system.
And about jaadoo; remember one thing, its Allah who runs the show!!!! He is still the Boss.
Stop worrying now, And open some typical thread so we can laugh at them.
Now come on!!