I have that experience before too.
Nurse taught me this and it worked for my baby.
My son was very afraid of fast milk. So, I always use hand to express the milk until it becomes slower and then let him drink. He feels much better. At first, I always express for about 5mins.
Gradually, after about 1 - 2 weeks, when he is adapted to it, I express shorter time. Then, later, I don't express, and he's ok.
This can ensure he can have the hinder milk and not just the foremilk.