 In short, mainly when I eat or drink coffee, I lose energy and I have to lie down on the bed. Then I mentally breathe deeply and in 5-10 minutes I get energy. In short, if I don't take a deep breath and rest for a while, I'm sick and unable to function physically and mentally. 

 can you tell me what it is And how can I help myself? Walking and physical activity do not help me. I've been like this for months now since I got off the Lexapro.