I have not applied to SSI, so I am just looking for a common sense approach. 1) Tell the examiner that you are always nervous around doctors and hate to talk.
2) Write down the story that you would have wanted to tell had you been inclined to talk and give the examiner. He or she may not have the time to read it but at least you will have tried. Make sure to list all the medications with dosages, even though a clinical psychologist is not a medical doctor.