Ok it doesn’t sound great and I think whatever you do now is just digging yourself out of a hole.
First remove the feeder new nucs made up in the apiary just need a frame of stores from the parent colony feeding when flying bees are returning to the parent hive is just ringing the dinner bell. You may get away with it atm if there’s plenty of forage but it’s best avoided.
Nucs need only a couple of frames of sealed/emerging brood not five, sealed brood is more robust but they’ll still die if they get cold.
You say you released the queen….Why?..You don’t release her the bees do in good time! If you released her straight away there’s a good chance she’ll be killed, perhaps if there’s no older bees in the nuc there’s a chance she’s ok but you’ll be lucky if this is the case.
Without actually seeing this nuc or the numbers of bees I’m imagining 5 frames of brood with a couple of handfuls of bees?
If this is the case in the morning inspect very gently and with minimal smoke to find the queen. You’ll need to find her and if possible re cage her. If she’s there the minimal bees and the brood are likely not viable as a unit!
If she’s found/caged I’d remake the nuc. Keep 2 frames of brood with emerging bees if possible find yourself a frame of food. Give the remaining frames back to the parent colony, shaking off every single bee on them before as they’ll likely stay in the nuc.
Finding the queen in the original hive and make sure she’s safe you’ll then need to shake or brush in more frames of bees. If you are moving the nuc I’d shake in say 3 or four frames, if the nucs staying in the same apiary probably a couple more.
Your queen should have come in a cage with a candy block. The tab on the cage should be removed exposing the candy and slide the cage between the frames of brood, allowing the bees to eat the candy and release the queen over time.
Once you’ve introduced a queen allow several days before going back in.
There’s advice given freely here if your not sure just ask, but I might suggest a little research or limiting what your doing to your level of experience.