I'm on the same medicines and have felt the same way. Im not sure if it's SAD or my medications. When are you taking your Lexapro? I read on another board to take it at night due to it making you drowsy. Today I took my Lamictal in the morning and will take my lexapro at night. So far today despite all the rain I am not tired and being very productive. I think I will stick with this medication schedule.