I am frustrated and don't see relief in my future

I am a 36 year old woman who has recently been diagnosed with panic disorder.  I take .5 xanax in the morning and then .5 eight hours later.  It seems like I will have a couple of days where it works and then I'll have a few days where it feels like I took nothing.  The only thing I noticed is that on those off days, I had caffeine.  I like a cup of coffee or two in the morning sometimes but not every day.  Could this be causing the contradiction?  Some examples...On Sunday I woke up and took  my meds, then went to the grocery store.  No problems.  No caffeine that day.  However, today I had a coffee in the morning and then a soda in the afternoon.  When I went to my hair appointment I had a panic attack in the chair.  I couldn't even let her blow dry it cause I needed to get outta there!  Please help!  Does this make sense to anyone?  I'm due to start therapy sessions next week and I hope they help!

 

I would lay off of the caffeine my doc told me to stay away from it because it affects my anxiety and my palpitations.

Nelle