I also started to get crippling anxiety on 40mg Latuda, which was new for me (now at 60mg). It was like intense terror but with no cause or physical symptoms. I had been taking the Latuda at night, which is also the time of day the anxiety appeared. Like you, the Ativan makes me too sleepy to function. The doctor had me start taking the Latuda with breakfast, and that has been better. The evening terror/anxiety went away.