i found the following online
"derealization occurs in the context of constant worrying or 'intrusive thoughts' that one finds hard to switch off. In such cases it can build unnoticed along with the underlying anxiety attached to these disturbing thoughts, and be recognized only in the aftermath of a realization of crisis, often a panic attack, subsequently seeming difficult or impossible to ignore. This type of anxiety can be crippling to the affected and may lead to avoidant behavior. Those who experience this phenomenon may feel concern over the cause of their derealization. It is often difficult to accept that such a disturbing symptom is simply a result of anxiety, and the individual may often think that the cause must be something more serious. This can, in turn, cause more anxiety and worsen the derealization. Derealization also affects the learning process. Because the individual almost sees the events as if in 3rd person, they cannot properly process information"
in other words its your minds way of protecting you when in fact all it does is makes your more worried as your feel abnormal.. leave it be it will pass in its own time.. trust me..