Screaming baby for sleep

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So something new started happening. My baby is screaming when he realizes it is time for sleep. Nothing but nursing him will calm him down. I was working on him falling asleep in his crib on his own. That was going okay for naps but not for nighttime sleep as well. He fights the night time sleep too because he ends up awake for longer then any other time frame-between 3-4 or even 5 hours. We try to pick them to sleep but during these times he won’t even when nursed, although it’s obvious he is tired. We have a nighttime routine and always have. He sleeps in a bassinet next to me, switching to a mini crib in the next couple weeks when it arrives. Has anyone else had this problem? He’s 6 months on the 24th.