I find out that the same neurotransmitter related to happiness and well-being supposedly has to do with your gastrointestinal system. There’s something wrong with my serotonin levels. I read about selective serotonin reuptake inhibitors, which are antidepressants. Would I have to take antidepressants? Or would I have to reuptake them? — I stand up and back away from the computer, put my head all the way back to stretch my neck.