Re the itching and the 'moving brain'. Have you checked with your doctor to make sure the symptoms are not an effect of your medication. People with panic disorder usually also develop allergies, food, environmental etc. We assume from your email your disorder is an anxiety disorder as our reply is based upon the symptoms you mention in an anxiety disorder context. We have found over the years many people with panic disorder do dissociate and the itching underneath the skin can be part of it.
Some people comment it can also feel like 'ants' crawling.
Re the 'moving brain'. We are not sure what you mean by this. Some people report a tingling or the 'ant' crawling sensations across the scalp. Some people report a vibration sensation, or they feel as if the top of their scalp is being cut off, others report a great pressure from within the head pressing against the scalp. None of these symptoms are in the literature but they not uncommon.