Aaawww! Strokes are caused by blood clots forming in the brain. This is most likely to happen to people over the age of 60, and can also be brought on by severe head trauma (like a car accident). Simply moving your head fast does not cause strokes. But you might hurt your neck muscles, and that would make you sore, plus possible headaches. I suggest you speak to your doctor about your anxiety. Get some counseling as well. - Blu
I agree, this doesn't cause strokes, although I'm not sure blood clots are the only cause of strokes. Strokes are basically like heart attacks caused by congested blood vessels, except in the case of a stroke the blood vessels can be the smaller ones that go to the brain rather than the ones most often connected to the heart. The causes are quite often the same in both cases -- oxidized material, often from foods we shouldn't eat or chemicals we shouldn't have inhaled such as tobacco, that, when oxidized, stick to blood vessel walls and clog them up preventing normal blood flow.
You cannot have a stroke from what you've described. There are three kinds of CVAs (cerebrovascular accidents) or "strokes":
A hemorrhagic stroke is caused by bleeding in the brain, usually from a ruptured vessel, and sometimes as a result of trauma.
An ischemic stroke is the most common kind of stroke (over 80% of strokes being ischemic). An ischemic stroke is caused when circulation is blocked to the brain. That can be caused by plaque in the vessel linings, or blood clots traveling to the brain, or stenosis (narrowing) of the vessels feeding the barin..
A TIA, or transient ischemic attack, or "mini stroke" is a stroke like occurrence that usually does not result in any permanent damage. A TIA is sometimes called a "warning stroke", because if the cause is left untreated, it can lead to a stroke.
Again, you cannot cause a stroke from what you've described. Have you had anxiety issues before? Do you normally worry about your health?