Almost all my life I've absolutely despised children. Pretty much from the moment I stopped being a child I've hated being around children.
It doesn't even matter what the child is doing. Whether they're laughing and having fun or screaming and throwing a tantrum. The sound of a child being loud activates an almost primal rage that I can barely contain.
I've had to leave social gatherings/restaurants/grocery stores all because if I'd stayed I'd have made a complete ass of myself by screaming at a child just for existing.
It's even worse with infants which makes me feel horrible because I know they can't help it. I know the kids don't know any better and it's our job as adults to get them through childhood, but my blood boils when they get loud or demand attention.
Has anyone else dealt with something like this? Is there anything I can do to stop from getting so angry?
Sensory processing disorder associated with autism is exactly what came to my mind because it's exactly what I deal with. I usually shut down instead of melting down, but kids playing at anything past a barely-audible level is extremely difficult for me. Other attention-grabbing noises are also difficult, like dogs barking, car doors closing, people yelling, etc., and other stimuli cause me to shut down too, like dogs jumping/breathing on me (basically everything about dogs, unfortunately) or someone touching the back of my head/neck.
It took a lot of research into how my sensory processing reacts to different things, and I still struggle frequently, but I'm a father now and most days I'm very happy about it. I have noise canceling headphones for when I get overwhelmed, and I keep a clicky mechanical keyboard switch and barrette in my pocket to fiddle with, which helps a lot.
OP, I can obviously only speak from my own experiences, but I think dissecting what exactly causes these sudden emotional bursts and finding sensory distraction or blocking techniques to dampen them might work for you too. Headphones are a godsend.
Edit: Definitely seek a professional opinion (if possible for you) and look into misophonia, especially if specific sounds are your only issue. I just wanted to provide my perspective because for me the exact same issue the original post describes was part of a broader thing that needed addressing.