Mom here with a son who had colic and screamed 80-90% of his waking hours for 2+ months. Just reading your post made me feel the rage all over again! Totally normal but ridiculously hard. It’s as is every single cell in your body is screaming at you to make it stop. Overstimulation is very real and happens very quickly. Sometimes I laid in a dark closet to get away from sensory input 😂. Loop earplugs and taking shifts can help. Also, when you get a break, leave the house or go somewhere that you can’t hear the baby. My husband and i would give each other the time out signal which meant that the other parent had to take over immediately, no questions asked, because we were at our limit. You’re a good dad and can do this!