I'm not enjoying being a mum😢

My baby is 5 months old and I don't think I can't do this anymore. Between colic, super fussiness and sleepless nights I think I'm on verge of having a breakdown, people keep saying it's going to get better, but it's not, if anything it's getting worse. Everyone else's babies are so happy and mine's is just so whiney all day long, my head hurts, I'm getting so frustrated. My baby is almost 6 months old, when is this colic going to go away? I'm not enjoying being a parent. My baby is the most fussiest baby I have ever seen in my life. I thought I was meant to be happy and enjoy being a mum, but I really ain't, I try everything to make him better but nothing works, doctors and health visitors have suggested everything they can. And just keep saying it will pass it will pass, but when? I'm going crazy!!!