I feel your pain. I've had similar scenarios with Louis, who has been fearful and reactive towards certain dogs since he was attacked several years ago. He's able to stay calm quite often nowadays, with my help, but dogs that charge up to him and bouncy puppies with no manners will always trigger his fear and reactivity.
Recent scenario:
In the middle of the New Forest a large Labradoodle with flowing coat comes charging towards us at speed. I call Louis close to me and call out to the Labradoodle owner, asking her to call her dog to her because mine is fearful.
Labradoodle owner calls back that he's friendly and wants to play.
I respond that mine is scared of large, bouncy dogs that run up to him.
Labradoodle lady says not to worry, her dog visits schools to meet children and wouldn't harm a fly. He'll just play.
I respond (in a less friendly tone) that mine is afraid of large dogs, so please call him away.
Too late. Labradoodle zooms in, Louis goes into panic mode and chases Labradoodle while barking and growling. He stops after a few seconds because he feels safer once it's run off.
Labradoodle lady looks offended and decides it's time to move off in a different direction.
I feel sad, because poor Louis will be on edge for a few days and less able to cope with other dogs we meet.