How do you deal with nightmares?

Hi! I struggle with cptsd and I have nightmares almost every night now, and they always end up with me having a panic attack and kind of regressing back to whatever age I was at the trauma I was reliving. Afterwards I’m really shaky and upset and I’m not sure what to do. Do yall have any advice for when you’re dealing with nightmares or how to calm down after?