Sorry you're hitting a rough spot. I know how those can be... Annoying how our mental health has to spread into every aspect of our lives, even the parts we love and don't want to mess up...

Is there anyway you can set up like a code word with your fiance? Like "Hey, I'm having one of those days" and then he can just come and hold your hand for a little while. I always ask my (now) hubs to "say soothing things" to me when I'm upset. Then he just holds me, pets my head, and tells me he loves me over and over. Sometimes it helps, sometimes it doesn't. Then we might do an animal alphabet (go through the alphabet letter by letter using animals... A is for Albatross, B is for Bengal Tiger...etc). It helps me stay grounded and distracts me from whatever is going on in my head.

I don't know if this advice is helpful at all, but I'm thinking of you, and hoping you are able to find some peace.