18 months here and I still have mood swings every now and then. They are usually to do with me having something going on that is bothering me and im not reaching out about or simply I am just having a day or moment. We are human like everyone else and will have mood swings. Like the book says we do have a slight mental twist . When I feel like that I do a few things to help listen to music, call my sponsor or do something for someone else, that always gets me out of my self. But yes it is completely normal (at least for me) Don't sweat the small stuff