Thank you Rohag
I think the community here will be of comfort and help to me, from what I've read so far.
I do use headphones some of the time, but I can't afford to replace the noise-blocking ones I had in college, as they now create a horrible whining noise instead of pleasant white-noise when I turn on the noise-blocker.
I recently bought a fleece headband with headphones in it for sleeping, but haven't had a chance to put good sleeping music onto my MP3 player yet.

My days off help a bit, but they are erratic and often busy. My schedule is all over the place at work.

I have been talking to my SO for a little while this evening and that has also helped me feel less frantic for the time being.