I can't sleep

I'm very stressed.
Sir and I had a huge misunderstanding.
Now we made up but I can't seem to shake this ominous feeling.
Feeling like maybe he's right and  I should break up with him. That he can't give me what I need.  :( I just don't agree.
We've been happy until this past month or so... I mean there is life to deal with, bad things happen, I think if we can't get through this how can either of us expect to have a relationship with anyone.

Sometimes I feel like I'm not important. No, that's not it. I'm important but, still expandable. I know that he cares for me a great deal.
He's proven it.
Then why do I feel like it would be OK with him if we broke up.
I don't know, I don't understand it.
I know it bothered me that he didn't want to say goodnight to me the other night.
And that he prefers to sleep alone.
It makes me sad.
But, tomorrow night I'll get to sleep with him.
But how do I stop myself from feeling like he'd rather not be sleeping with me.
I am having a lot of issues.
I don't really know how to deal with it.

And my sister-in-law died a few weeks ago.
Then I got really sick and I'm not yet fully recovered.
And I'm very hungry.
What do you want to bet that I just need to eat.

I'm still grieving. I am not back to my happy self.
He's has two close friends that he cares about who've had deaths recently... It takes time to come back from that
And he's having an awful time at work.
Should I ... We... Take a break?
I'm not sure.
I don't want to be a burden to anyone. Least of all him. I want to bring happiness to his life, not stress.

It's 5 am in 4 hours I have to get up ugh! Why can't I sleep!!!??