Lavazza1st. I do hope you soon feel better.
If I may answer a little pompously as a retired Psychologist and as a dog lover please:
I want to tell you that I think your response - screaming - was
entirely normal and justified.
Of course you screamed! That's what our automatic screaming response is for! To scare off the cause of our injury and to alert others that we need help!
As for the dog's owner.... he is a pillock of the first degree and should not be allowed to have a dog. What a totally nasty man! Of course he should keep his dog under control and on a lead, for his dog's safety as well as for the safety and comfort of others.
I do hope the aches and pains soon ease up and you feel much better. I would not worry too much regarding the dog. With luck it will be found by good people who will take it to a Shelter and it will go to good Owners. More likely it will go back home though.
The Republic of Ireland and their tensions with migrants.