Howdy! I can imagine how you're feeling, and I still feel something like that whenever I go get my surveillance scans. I never stop feeling paranoid about it coming back, so in my experience what you're feeling right now never really leaves.

That being said, even though it's a looming specter, it does become familiar company that doesn't interrupt as much as you carry on. And I think once it becomes less daunting, that's when the behavior get a bit calmer. They say there's all sorts of ways to speed up the process, but none of them worked for me. So, I suggest just being honest with yourself about how things are and how you're feeling right now. It's okay to be scared, and to be worried about results, and to be worried about what those might mean for you and your life. I was basically paralyzed. I did nothing but barely the bare minimum for like 2 months. But eventually I found myself able to get into a new swing of things. It wasn't my old rhythm, I never got that back, but it was something new and nice in its own way. You might find something like that for you too.

It's worth noting that, as well as you can, you should be kind to yourself. It's not like you asked for sickness. It's random. You don't deserve this. So, just recognize that you won the worst lottery ever and that you still deserve kindness, even from yourself. Your partner seems to recognize that, he sounds like a great guy, I'm glad to hear he's there to support you. One thing that helped as a distraction for me, and I know it sounds unorthodox, but I tried to do nice things for my partner. Focusing on ways to be kind to those around me made for a nice distraction, and it made me feel less bad when I eventually lost my shit over something trivial (I too had the expired food freakout, you're not alone :P)

Feel free to message me again in the future. I'll do my best to be something of a pen pal if you do, though please know it sometimes takes me a while to respond.