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.
If you require further clarification or more information, feel free to ask!
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