I wonder if Briviact is interacting with something else you are taking?

It is very interesting that you had almost the exact same experience with those three drugs as my daughter. We assumed Keppra was contributing to her anger/suicidality but weren't offered any different. When the dose was quadrupled, it became obvious and she was put on Lacosamide which didn't stop the seizures and then Briviact instantly stopped hers too! She had immediate HORRIBLE side effects that mostly fell under the category of vertigo and she couldn't function. She was also on Wellbutrin and when that was removed (there is a known interaction), she was mostly fine. She is nauseous but she has dealt with that since the onset of seizures. She hasn't been on it long enough to know if it causes weight gain but I hope it doesn't.