"Tori's stressed out of her mind, and super uncomfortable," he confided in mom Amy. "The dwarfism factor...Emotions are super high. It's not going to stop until the baby really comes."

The mother of four, 52, hardly reassured her son.

"Until that baby arrives, you don't even know what stress is!" she said.

"The whole thing is so stressful. It's one big vicious cycle of stress!" he lamented to the cameras.

The stress came to a head when he suddenly suffered from a bout of nausea and a severe migraine, symptoms that began at the beginning of Tori's pregnancy last year and continued at least once a month.

Zach made his twin brother Jeremy and sister-in-law Audrey pull the car over so he could get sick. The trio quickly rushed to Zach's doctor for an emergency appointment.

"It's never been this bad!" he said. "The headache is what's killing me."

Jeremy admitted his heart began "racing."

'His eyes were going crossed!" he told a concerned Audrey outside the doctor's office. "He was in there on the ground, just holding his head."

Fortunately, Zach was released after two shots for dehydration, pain and elevated blood pressure.

His doctor told him the symptoms likely stemmed from severe anxiety — not complications from his shunt, which was surgically implanted in his head to drain excess fluid as a child.