One definition to try and tease out the distinctions is
From "Anxiety Disorders and Phobias - a Cognitive Perspective" by Aaron T. Beck. M.D. and Gary Emery, Ph.D. with Ruth L. Greenberg, Ph.D. (1985):
"When a person has anxiety he experiences a subjectively unpleasant emotional state characterized by unpleasant subjective feelings, such as tension or nervousness, and by physiological symptoms like heart palpitations, tremor, nausea, and dizziness... Panic is an acute state of anxiety associated with other dramatic physiological, motor, and cognitive symptoms. The physiological correlations of panic are an intensified version of those of anxiety - that is, rapid pulse, dizziness, cold and profuse sweating, and tremor. In addition, one has a sense of impending catastrophe, pervasive inhibitions, and an overwhelming desire to flee or get help."
(pp. 9-10).
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