The major character is john, he has a girlfriend. He gets into an accident and goes into a coma. While his is in the coma his girlfriend gets married to another man, has a baby (his baby) he wakes up from the coma with the ability to see the future, what he sees is people die. His physical therapist is black he has long black hair when he gets out of the hospital his pt works with him to save the people who dies in his visions.

What you have described sounds like the TV series the Dead Zone:

http://en.wikipedia.org/wiki/The_Dead_Zone_(TV_series)

(there is a movie from the 80's, but your description of the PT Leads me to believe you are looking for the tv series...)