Ways and Means to get rid of Serotonin Deficiency So what are the top symptoms that can tell you that you have a Serotonin deficiency? 1. You feel tired a lot. You are fatigued more than you can handle. 2. Insomnia is a major sign that warns you about Serotonin deficiency. Serotonin-deficiency.com~Site InfoWhoisTrace RouteRBL Check