@Hullllla I promise you, it isn’t that he doesn’t like you or isn’t connected to you. I also know you’re sat reading this thinking I don’t know what I’m talking about it, but I’ve been there.
I was convinced my daughter didn’t like me, loved others more, wouldn’t settle for me, etc, and that was even with having a rough idea of the cause of the screaming (reflux and digestive issues).
It could be a multitude of things that are causing him to cry, but I promise NONE of them are to do with you! Look how hard you’re trying to figure it out and do your best for him, you’re already a great mum! You might not like him very much right now either, but you’re still concerned enough to be asking for advice, so you’re doing great!
My first piece of advice, as it does sound like it could be colic/reflux, is get back on the phone to your GP and absolutely demand that you receive either a call back or a video appointment, as this is affecting your mental health as well as your son. There should be no reason whatsoever that can’t arrange one of the two.
In the meantime, we had some luck with a mixture of Infacol, bicycle legs (lay him down and alternately push his legs up towards his belly and back down, like he’s cycling), baby sensory videos on YouTube, and holding/laying her at an incline so she wasn’t flat on her back. Obviously only when she was in sight of us and we could tend to her immediately if needed.
Granted it may not be reflux, but it can’t hurt!
Have you thought about changing his formula at all to see if that helps?
PM me if you like and I’ll be happy just to chat if nothing else :)