Panic Dissociation

I recently have come to have Panic Disorder. Since about half a year ago I started having panic attacks. I now have them just about daily, and I often wake in the middle of the night in a state of panic. Lately I felt I was doing a bit better, and I've started receiving behavioral therapy, which I'm very optimistic about.

Recently I had a very severe panic attack. It began with a very bad headache and nausia, which steadily grew worse. I became sensitive to light and sound as well (this might have just been a coincidental sinus headache, I don't know.) My panic attack was terrifying and painful, and when it was at its worst, I looked down at my hands and I suddenly had this sensation that they were not properly attached to my body- as if I was looking at someone else's hands. I became terrified to look at my hands, and I felt dizzy and surreal. I'm not sure what to make of this, though some stuff I've looked at suggests to me that this is dissociation. I don't believe that I am losing my mind but I am wondering if anyone else has experience with any or all of these symptoms, since these symptoms are novel to me. Is this dissociation? did this headache have to do with panic, or was it unrelated?

yeah depersonalization/derealization, they are horrible things, especially because so so many docs/psychs etc don't actually know of or understand the term so when you try and describe it they think your crazy. I get these, and it was my biggest relief to find out what they were. So you are not going crazy.

I used to get that feeling when I'd have severe panic attacks, like I was disconnected from my body. sometimes everything around me was brighter and louder than normal. I also found if I was around loud sounds and bright lights e.g in a movie theatre, listening to a band it could trigger an attack. My Dr said it was sensory overload.
hope your treatment is going well. It can take a while but things can get better :)