Hi CC,
The feeling of derealization or "fogginess" is a common symptom of anxiety. The first thing to do is get a feel for at what level of anxiety does the symptom start to appear. Start to rate how anxious you feel on a scale of 0-10, where 0 is perfectly calm and 10 is a panic attack. Practice asking yourself, "what's my rating right now?" at various points of your day.
Anytime that your anxiety hits a level 5, it's time to intervene. By the time a person gets to a 9 or 10, there's not much you can do until the panic attack is over.
What you can learn right now:
Abdominal Breathing
Progressive Muscle Relaxation
Also, look into getting into Cogntive Behavioral Therapy (CBT). You can find a specialist in your area by going to the Anxiety Disorders Association of America (ADAA) website.
Regards,
Jennifer L. Fee, Psy.D.
The Stress Masters