Welcome to HCM
We understand your concerns
I went through your problem description. Broca Aphasia
is totally curable and you donot have anything to worry. You speech problem should be due to some maladjustment problems of vocal chords arised out of the accident.
I suggest you to meet a speech pathologist or speech language therapist who shall advice you about the problem. You cannot get the treatment online. Better consult in person.
Hope this answers your query. Available for further clarifications.
Good luck. Get well soon.