is there a relapse with panic attacks?

i have been suffering with panic attacks since august04. i began seeing a homeopath (and still am seeing him) and found my condition to get better. Aside from the odd dreamy feeling and bouts of breathlessness, i was much better. my agorophobia cleared up and i could go places with very little anxiety. This past week however has been hell. i am feeling panic and anxiety attacks all over again. For example, today i was on the subway and felt panicky, anxious and as though i was going to faint. When i finally got off, i ran into a little store and began to hyperventilate.
Is it possible to go through a relapse period, even while being treated?
Please help!!
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