Since + present perfect

Hi! Two weeks ago I came back home after having spent two weeks on vacation. How would I say?

"Since I came back home I've been really busy". <em>This is correct.</em>

Let's suppose then that right now I'm not home but I've been in London for two weeks and I've been struggling with the bed that's not comfortable. How would I say?

"Since I arrived (here, in London) I've never slept the entire night without waking up." <em>This is also correct. You could also say, "Ever since I arrived..."</em>

Thanks.

<em>Nice job!</em>