What is the right way to talk to a friend who seems to be in trauma?

What are the right things to say and the things to avoid saying when a friend just experienced what seems to be trauma from almost losing total consciousness while driving on a highway at 70 mph. He managed to park the car and call 911 and got help.

After a brief hospital stay and heart monitoring at home for two weeks his doctor cleared him of any heart issues and said he could go back to work. But…he is presently unable to drive and even walk with confidence to do some work in his own yard. He sweats and trembles most of the time. He plans to seek pro help. In the meantime he wants to talk to friends hence this question. Thanks.