He told the inquest his father called him up to six times a day following the recording.
“He was OK at some points, but very down,” he added.
He said he tried to encourage his father to continue getting aftercare support from ITV.
He said: “He told me he was getting support and aftercare from the show’s counsellors.
“I explained to him he needed to get in contact with them and keep ringing them to get the aftercare that he needed.”
A pen portrait of Mr Dymond by his brother Leslie was earlier read out to the hearing.
He described how, as a young man, Mr Dymond had been a “dedicated” RNLI crew member involved in rescues at sea.
“It was a dangerous job. They were very brave men and Stephen was one of them,” he said.
In his statement, Leslie Dymond recalled how his brother was “very distressed and consumed” by what had happened when he appeared on The Jeremy Kyle Show.
“He repeated that he had the result of a lie detector test, which he did not agree with, pushed in his face, and (was) called a traitor, with the presenter and audience all heckling him.
“Stephen told me he had been at the point of collapsing at the studio but he was still heckled.
“He did tell me that the audience had booed him, that the presenter, Jeremy Kyle, had been in his face and that he had been followed when he left the stage with cameras and microphones being put in his face.
“He told me he was jeered and called a failure by the presenter.”
Mr Dymond died of an overdose of morphine and a heart problem at his home in Portsmouth, the inquest was told.
The hearing continues.