My spouse is being overbearing at a time when I really need space from him, advice?

Its better to open up to him for the space you need. Would help him understand your mind.

I also would not phrase it to him as, "Being around you makes me feel worse". but rather, "Being around you makes me think of... and I feel worse"

Tell him the truth. There’s no one way to grieve. It’s a very individual process.

Communication is key. How is he supposed to know if you don't tell him?

You need to communicate that to him. I’m sure he will understand.

I'm sorry to ask, but why must you grieve?

Tell him honestly