New puppy and separation anxiety

I recently got a puppy (two weeks ago) and he’s turning three months in a couple of days. The last couple weeks have been very challenging (especially the last few days). He has obviously been very clingy as all puppies are however it’s been really difficult to deal with the crying when he’s in his crate and I’m not physically next to him in the same room of course. I started off having his crate in my room for a few days then I moved it downstairs to where he will permanently be I even slept on the sofa for a couple days and eventually moved upstairs to sleep in my room and left him downstairs. He was doing quite well for the couple of days apart but all of a sudden he’s become very restless at night screaming, shouting and crying for most of the night again I understand that this is something that’s quite common with crate training and new pups but I just wanted to know if anyone had any advice. He also gets very upset if I’m not in the same room as him (I am a solo pup mum) whether he’s in his playpen or whether he’s just in a different room and I’ve stepped out of the room. I’ve tried to find videos and advice and I know that it is early days and will take some time but any advice would be great and even some encouragement or stories that anyone would like to share!

thank you!🐾