Bleurghghghgh your father sounds like a terrible persojn.
"It wasn't particularly aggressive, if that makes sense." It doesn't. If he had accidently pushed you over then that would make sense and should be followed by profuse apologies but the fact he "...was angry but not uncontrollably so." Suggests that it may not have been a total accident and that you have become quite accepting of people, men him, being angry with you/angry in general.
This is not your fault at all.
"We were round the corner away from everyone else and when I went back in, trying not to cry, was met by dirty looks by him as if daring me to say something. This was hours ago now and I'm still so upset and angry"
So not only did he not apologize but he also tried (succeeded) in making you feel bad for feeling bad at being knocked over and not having an adequate apology.
Your ex doesn't sound very nice, why are you considering getting back with him?
I really would like to suggest you need genuine empathy and not sympathy.
[[https://www.youtube.com/watch?v=1Evwgu369Jw]
You sound like you may have had a tough time wiuth your dad and maybe you would benefit from talking about it with pepopel who have experiecen thsi, perhaps consellng.