How do you enjoy a baby that doesn’t want to be enjoyed?

My baby is always so damn unhappy and I’m wasting away giving everything to take care of him. Doesn’t sleep through the night, fusses all day and doctors are just 🤷‍♀️ I spent all day yesterday prepping food and getting him goodies to get on a schedule with solids. What does he do? Gag until he vomits. I just can’t anymore. I’ve had to quit dairy and eggs so I can keep up with breast feeding and I’m down to 94 pounds because I work a crazy schedule and don’t have time to make the appropriate snacks. Y’all what do I do. I love my baby but I’m starting to really feel resentful.