I think some kids are just like that TBH. Aidyn begins crying at the doctors as soon as we walk into the room. Even if its not HIS appt, he will still cry if he sees Mummy or Daddy being prodded. Heaven forbid the doctor tries to touch him to see his ears, throat or listen to his heart... he screams and cries, and has been doing so since at least 6 months of age.
In Aidyns case I dont think this behaviour is towards everyone - but mostly if its a stranger, or someone he is not comfortable with, who is pushing past certain boundaries of contact - or even watching him too much etc he gets VERY upset.
He also has the type of personality where he does not take to new things easily, he needs periods of adjustment, or else he gets scared and cranky - no matter what it is! even if we go to a new playground he will be too scared of trying the equipment out and we have to slowly coax him and build his confidence up.

Goodluck with the immunisations Angel... I know it probably wont be easy... *hugs*