It's understood Nicholas struggled to get through a tea-time segment with Pakistan great Wasim Akram, before again succumbing to severe abdominal-related pain in the breakout area off air.
He was sweating profusely and later complained of headaches.
Australian team doctor Peter Brukner was immediately called to assist Nicholas, before paramedics were called to stretcher the 59-year-old to a waiting ambulance and then to hospital for further testing.
Nicholas left the Melbourne Cricket Ground in agony, but conscious and breathing.
The latest incident wasn't as dramatic as the events on Boxing Day, when Nicholas was rushed to hospital in a frightful sweat.
However, there are concerns that the problem hasn't been fully diagnosed and that Nicholas suffered a reoccurrence just two days later.
