Anxiety and tension are almost always seen together. As anxiety increases, tension in the whole body becomes more pronounced. There are various types of anxiety. There is the free-floating anxiety and the anxiety associated with certain places such as the theatre or shopping centres. Anxiety ranges in severity from mild anxiety, which does not impair performance, all the way to that degree of anxiety which makes a person totally dysfunctional - the extreme of Generalized Anxiety Disorder which is almost incapacitating and commonly there all the time.
Panic is anxiety which has gone beyond the level of the manageable.
Panic is loss of control. Panic is totally irrational. It seizes your mental processes. It paralyses your gut. When anxiety turns to panic, it becomes dangerous, not only to yourself, but to others.