About to burst into tears

My son is the most unhappy baby on this universe. He's never happy. All day long he's either screaming at the top of his lungs and it's so high pitched and shreaky that I want to kill myself, or he's crying about something. I'm really the only one who can calm him down so it sucks when I'm trying to take a nap and I can hear him freaking the fuck out for my husband. He's just never happy. It's always something with him. He had his 6 month appointment last week and his doctor didn't feel teeth so teething isn't an excuse. Idk what to do. I don't enjoy him. I honestly want to just leave him there when he cries and go away. I have gotten 3 hours of sleep in the last 24 so I'm cranky, irritable, exhausted. And he's just making it worse. He doesn't eat solids, he's just not interested. Has been barely taking his bottle. Idk what to do. I've had it.