night time panic!!!

So it has been awhile since I have had a full blown attack. I was given by my dr. Xanex to help out for times when I feel anxious! Well I was taking a low dose daily to help curb my attacks and today I felt good! I thought I don't need this today, well I def needed it tonight.
I fell asleep I was so beat and next thing u know I shoot out of bed in pure panic thinking that I stopped breathing!! It felt like I did 2.
I got out of bed as soon as I woke up I got my medicine.I was shaking like a leaf and My heart rate was up but after the meds it is back down to the 80s but I keep having pain in my left arm its making me paranoid! I don't know if this is my anxiety rearing its ugly head or what! Someone help me i feelblike death