I am scheduled for a CT Myelogram Lumbar Spine next week. I have read that they can be extremely painful. I have 5-325 Percocet on hand. Is there any reason I cannot take a few of them BEFORE the appointment? I also currently take 60 mg Cymbalta. The purpose of this test is because I have foot drop and leg numbness as a result of lumbar fusion on 03/03/16.