I did a med search and came up with this info for you about Kepra.
generic name: levetiracetam -- leva-ti-RAS-e-tam
Manufacturer: UCB Pharma
Keppra (KEPP-ra) was approved by the Food and Drug Administration in 1999 as an add-on therapy for partial seizures in adults. It is available as tablets. Side effects include sleepiness, unsteadiness, infection, behavior disturbance and dizziness. Side effects are most likely during the first 4 weeks of treatment. Has not been reported to interact with other antiepileptic drugs, Warfarin, or oral contraceptives. It reaches a steady state (that is, an effective treatment level in the blood) approximately two days after it is begun. Safety in pregnancy has not been established. Women who are taking this medication and who wish to become pregnant should discuss treatment options with their physicians before the pregnancy begins.
Personally I have had no experience with it. I am on 1350mg of trileptal. I did experience the effects that you did with trileptal in the beginning, but fortunately I evidently built up a resistance. Occasionally after my evening dose, (750mg), I will feel lightheaded, but I have timed it so that I take it shortly before bedtime. I have found that in many cases, medication and dosage is an individual thing. Hope that kepra works out better for you.
God Bless....In HIS Service....Dan