I’m ok , sometimes I just have random depressive episodes

Most of the time what causes them is just me overthinking but sometimes something else triggers it. Nothing triggered it last night expect for me overthinking. They are very scary because I don’t think clearly when I’m having them , i have to make sure I don’t make decisions during them , I have to sit in the changing room until I’ve calmed down. It’s like Something takes over my whole body and personality. Once I’ve calmed down , im back to being my happy and calm self.