It does take me about 2 hours to calm down enough after a social event before I can sleep, and that actually does have a lot to do with hypomania for me (don't get enough sleep because I was out late socializing and in a different time zone to boot!)

Hard to know from your description if that's a mixed episode, but it's rough going in any case. Good luck with getting meds to work out - eventually most of us seem to find something that helps. You're still on quite a low dose for Lamictal so it may continue to improve as you titrate up on it.