Absolutely, see your doc ASAP! I had Lamictal rash. However mine was limited to my chest & didn't hurt... just a bunch of red blotches. I went in to see my GP and he sent me right away to see a dermatologist whose offices were in the same building. She was on her way out when my GP called. But she stayed to see me. They took me off of the Lamictal forthwith. And the rash faded away. Given what you describe, if you can't get in to see your doctor immediately, I'd be in agreement with ArtleyWilkins. Your condition may well be ER-worthy. Best wishes...