Baby won’t stay asleep unless in my arms !

My baby is 6 weeks old and for the past week has been sleeping terribly . I rock him for a good hour almost till he seems to be in deep sleep but as soon as I go to put him in his bassinet he gets fidgety and then wakes up 😩 neither one of us have gotten much sleep all week. I have a fan on for “white noise “ sound . I don’t swaddle him because he hates it but it’s nice and dim in the room and everything.. not sure what else to do but I think he’s is getting over exhausted and more And more cranky from it . He won’t nap during the day anymore for longer than 15-20 min at a time. Help !!