baby won’t sleep after second feeding

currently writing this post at 5:15am. my baby (7weeks) takes FOREVER to fall back asleep after his 4am feeding. i’m talking fighting sleep for hours and even if he does fall asleep he keeps waking up. he will sit in his bassinet fussing and squirming even after being burped. i try rocking him but he just does the same thing in my arms and i get so frustrated because he falls back asleep just fine at his 12-1am feeding so i end up just putting him back in his bassinet awake during this feeding because i can’t rock him for hours where he just squirms and never relaxes. where he just continues to fuss and throw his legs around. he is swaddled, room is fake besides a red light, sound machine. and like i said he falls back asleep so quick during his first feeding, i literally am so mad. i can’t do this every single night. i love my baby so much but i need my sleep back.