Oh OP - it sounds awful.
When my son was 4 weeks old he started screaming and screaming all the time. The nights were the worst and nothing I could do would soothe him. If he slept in the day it would only be for very short periods and then he’d wake up and be upset again.
I took him to the GP who said it was likely reflux and prescribed some Ranitidine. That worked for a few weeks but then his symptoms ramped up again and I went back to the GP. I ended up crying because things were just so bad.
The GP said that the symptoms were most likely then to cow’s milk protein allergy. I was breast feeding but he prescribed me ten tins of Nutramigen and said it was up to me whether I switched to formula or whether I removed dairy from my diet and continued breast feeding.
I decided to continue BF and within a few weeks of me removing dairy from my diet I had a different baby.
He’s two years old now and he still can’t have dairy.
CMPA is very, very painful for babies so please let that spur you on to asking your GP to trial some dairy free formula. I know you feel like you hate your baby but I doubt very much that you want to see him in pain so please discuss this possibility with your doctor.
And as has been said before, Lactose Intolerance and Dairy Intolerance are two completely separate things although for some reason a lot of people seem to think they are the same. Lactose Intolerance is very rare whereas Dairy Intolerance is quite prevalent.
It sounds like things are really tough and I’m sorry you’re feeling so low. I really hope the GP agrees to trial dairy free milk so things can improve for you both. Even if he doesn’t though, I believe it is something you can purchase yourself and you have nothing to lose by trying it.
The best of luck and I hope you see the light at the end of the tunnel soon 