You are not nuts.
Your shrink needs to understand that such an expressed viewpoint isn't in the slightest bit helpful. Perhaps you could communicate this to your shrink?
As for the itch, it's a very real Lamotrogine side effect.
Please speak to your prescribing doctor about this. If the prescriber is your shrink, perhaps it would be helpful to discuss your experience of this as a matter of fact and not as a matter of mental dysregulation!