Hashi,
I was on Latuda for many glorious years until medicare stopped covering the full amount and I was expected to come up with $500 a month for my prescription. If my memory serves me correctly I didn't feel the effects immediately but it was more gradual than anything else. I guess what I am trying to say is that it took a little longer than a few days and was more on the order of a few weeks before I woke up one morning saying "I feel good today".
Hang in there and give yourself sometime for the Latuda to take effect. If your experience is anything like mine it will be worth the wait.
Drew