I've heard judges who have talked about this. I think the universal consensus here in the United States is that it would be interference with the jury process itself to have anyone reaching out to the jurors. If the juror were experiencing such high stress, it would most likely be brought to the judge's attention, and they would excuse that person and replace them with an alternate. Everyone else I've ever heard from has said, “No, we'll provide services after the trial is over.”
As well, at the front end, during the jury selection process, try to identify and remove jurors who are probably not emotionally stable enough to be able to deal well with the particulars of that case.