According to his lawyer, Sheriff Mohammed, Simbarashe had bad stomach cramps and his chest was sore.
He asked that his client be sent for medical attention immediately, and the matter was postponed until Monday.
The 40-year-old Zimbabwe national is on trial at the Western Cape High Court for the murder of Nikita Lewis, 24, from Factreton, who was stabbed to death in an Athlone shop in 2015.
It is alleged that Simbarashe threw acid at Nikita’s face on 9 August 2015, badly burning her.
She then sought shelter at the Saartjie Baartman Centre, where he allegedly stalked her.
Later that month, he allegedly followed her to a nearby shop, where he stabbed her 20 times in front of shocked witnesses.
Simbarashe has denied the charges against him, and claims he thought there was water in the bottle which he threw in Nikita’s face.
He also claimed that they were busy reconciling while she was at the centre, and that they were going to get married.
On Monday, State witness Linda de Bruin who was at the centre with Nikita, told the court Simbarashe attacked Nikita in front of her and two other women, and that he assaulted them to get to the terrified young woman.
Next week Monday, the Bangladeshi shop owner, Ahmed Mohamed Jahid, 36, will take the stand.
Jahid told the Daily Voice in 2015: “He grabbed her, mounted her and stabbed and stabbed, till she did not make anymore sounds.”