Yeah my father is on a high dose of Keppra for epilepsy and he said a similar thing.
So you experienced the loss of libido which eventually subsided? That makes Keppra seem a bit more appealing.
I agree with what you're saying, I'm just concerned that rather than this simply being a worsening of symptoms as an onset thing, it will remain unless I stop taking the medication, like others have stated.
I have yet to find anyone who has experienced a worsening prior to improvement, especially for lamotirigine.