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What other symptoms do you have?
General Anxiety Disorder refer to worrying excessively about everything. Most people[lye worry, but people with GAD worry about everything. Wobbly or weak knees is a physical manifestation of anxiety. Of course, I wold go to see my doctor to eliminate anything more serious than anxiety. I have included a link about GAD, symptoms and treatment. See: http://helpguide.org/mental/generalized_anxiety_disorder.htm
There are other physical manifestations such as sighing or "jittery hand" If you haver those type of tremors there are medications to reduce the symptoms.
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