Our daughter had a lot of anxiety and mood swings. For her, we traced it to lack of sleep, starting a bad cycle of worrying all night, getting less sleep, then perpetuation of the anxiety. Got her on magnesium and lemon balm supplements (after research, not some cockamamie MLM ploy) and saw results within a week. Seven years later and she is still going great. Board mail me if you would like a PDF of the research that I used.