Tips on not taking stress out on my fiancé?

I’ve been with my fiancé 5 years and have been under a ton of stress the past 6 months - finishing college program, taking care of our toddler (he’s full time first responder), planning a wedding/overseas honeymoon, family drama, and whatever else. I admit, when i get stressed, I often take it out on him & get in an irritable mood & nag him to death. How do I stop this?? I’m sick of nagging & so is he. Any tips to stop worrying 24/7? 😞