Anxiety at night!!

FTM and my little one is 13 days old. I get super anxious when it starts to get dark outside bc that means bedtime is near. I have gotten very little sleep past couple of nights bc LO stays awake. I've tried swaddling and pacifying and Breastfeeding. Finally the only thing that works is snuggling him on my arm. Which in turn means zero sleep for me bc I know he should not be on my arm or in the bed. I just need some advice or perhaps reassurance that this will get better. I KNOW having a newborn is not easy; the lack of sleep is tearing me down. It's like I have a complete mood change at night and I hate it 😞 brings me to tears.