It's hard. You're knackered but please know that babies do cry. They don't have words so,it's just that you have a 'chatty' baby who has a strong sense of what he likes.
Now you have to work out how to live with that.
You say he 'hates' things. Try thinking about it differently 'he's getting used to it' and 'he's a bit scared/apprehensive'. Soothe him with gentle words 'it's OK, you'll be fine, mummy loves you, I'm just here' stroke his belly or just out your hand on him. Stay calm, breathe. Be confident. Play some gentle Mozart piano concertos, gently and quietly. They are very soothing for both of you and proven to be positive for babies' brains.
Persevere with the sling. Let him cry in it whilst you get on chores, breezily chatting away and telling him what you are doing 'so now we pop the teabag in the cup and walk to the fridge to get the milk. The milk is cold. Ooh can you feel that? Etc etc' . It brings a kind of calm normality and rhythm to things. Focus away from the crying. Let him cry through it. He's safe. He's loved.
Try swaddling. It's miraculous. Swaddle and hold him at first, then put him down next to you. Again soothing voices, maybe music. What are the nosies he used to hear in utero? Can you replicate any of those (for my first it was Pete Tong dance music 😬, worked a treat for both of us to calm her down ).
If you can bear it, get a trusted friend or fellow parent to take him out in the pram (crying or not) for a pre-agreed amount of time, say mad hour, and get some rest whilst you have peace. You may even manage to nod off for a few minutes.
It's a hard time, but babies cry, and it doesn't harm them, you need to learn to harden yourself a teensy bit more and help your baby to feel safe in the new situations he's exploring right now.
You will get through it.
Oh, and sniff the back of his neck lots as that glorious sensation doesn't last long and is a truly wonderful part of motherhood. ❤️