I can totally see how it is easy to miss some developmental milestones with that to deal with. But I would say, just because it hasn't happened yet doesn't mean it will never happen. Not being able to control emotions can be typical ADHD, and when someone has that, a lot of other learning is sort of put on hold.

In this case I think maybe neurofeedback? It's bull in many conditions, but with these things it might help, because it is strengthening the feeling of control over thought and emotion.