My one year old is a knucklehead mcspazzatron

15 month old boy. im trying to see what i can do for my baby. Dentist. He screams and cries, doctors he screams and cries, haircut he screams and cries. To brush his teeth he screams and cries… i wanna know first and foremost… why??? Lol. Just why. It doesnt have to be this way?? And what do yall recommend for him to settle down at these trying times