I'm up to 75mg Lamictal, not having any noticeable problems. It makes me pretty manic for a couple days after increasing the dosage but then that goes away.

Rosie23, if it doesn't make you too un-sleepy, you could try taking the Lamictal in the evening so you wouldn't wake up from it wearing off and you might avoid the depressive dip because you'd be sleeping. Just a thought - I was originally taking mine at bedtime and it was making me very not sleepy, so I switched it to the AM and it's way, way better for me that way.