Hmmmn...my Lamogtrigine dose was recently increased from 100 to 200mg and I have had more racing thoughts and insomnia. I did talk to my pdoc about this but as there are so many other factors at play in my life(Gone off anti-d, gone off lithium temporarily, starting ECT...) it is hard to know what the culprit is. Could you ask your pdoc? Going on other peoples posts it is definitely a possibility.