Trileptal is well known for causing fatigue and sedation in many of our patients who take the medication for epilepsy, facial pain and numbness, or other reasons. It's possible that the tumor has a role as well as stress, but I would be more inclined to attribute the symptoms to the medications. One thing you could try is to lower the dose or try another med such as elavil, an antidepressant that helps with facial pain. Talk to your docs about your concerns and possible medication adjustment. Good luck.