I'm not in total agony but oh my, anxiety and withdrawl can cause those nasty intrusive thoughts and images - I had them too. And no, you aren't crazy. This very issue came up on a thread here within the last couple of weeks. I tell myself that my brain is lying to me and that seems to help somewhat but distraction is my biggest weapon and the slogan "Move a muscle, change a thought" is pertinent here. Get up and clean out a closet, go for a walk, straighten some drawers, cook a meal, do some laundry - in other words get busy. It sounds like grunt work but it serves the purpose.