The human body is designed to do certain things in a certain way. Each person is an individual, and each person has their own flexibility levels, but the basic constraints remain.
If you had to perform an action that either fell out of the ordinary, or fell out of your personal ability to stretch those parameters with flexibility, you have over strained something and, perhaps, done more damage that good.
My suggestion is, see a doctor. Pain is your bodies way of telling you something is amiss.
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