My understanding is that a therapeutic dosage for Lamictal begins at 200mg and that it's efficacy is minimal before then. It is necessary, paramount even, to slowly step up the dosage over a period of weeks (follow your p-docs instructions without exception, especially in regard to Lamictal/Lamotrigine).

I would suggest you consider that the current experiences you are having are due to an episode of hypomania or mania. It may also be a placebo effect - I personally find it extremely difficult to distinguish between psychological and physiological influences on mood. And, as always, be observant and exercise caution when placed on new medications.