Hi there and {{{HUGS}}} for going through a tough time.
Remember that ds is only 2 weeks old and is still thinking he is inside the womb, where they mostly slept during the day while you moved around and had a rocking effect on him and kicked and turned during the night while you slept and laid still. Babies don't know that night is for sleeping and day isn't. Especially a baby this young. It's our place as mommies to teach them that. Unfortunately a baby so young will sleep 20 hours out of th 24 and won't really "get" a routine. They start doing that after 6 weeks of age.
My ds also had night switched for day, and my what worked for us was to keep the lights off when he woke. We had a night light in the bathroom so I could see barely enough so as to not fall on my face. I would do everything very slowly, not make eye contact or speak out loud. I wanted to send the message that we don't interact at night. During the day I wouldn't force him to be awake, newborns need their sleep too much. I would take advatage of diaper changes and feeds to keep him up even if it was for 5 mins longer.
I'm sure your "little rat" will make the switch, he just needs a little guidance.
Let me know how you get on
- Beca