Nathan Coulter-Nile mystified by worrying illness ahead of World Cup

Nathan Coulter-Nile is still searching for answers regarding last month's mid-match bout of vertigo but his more pressing priority is a pivotal series against Pakistan.

Coulter-Nile recently dashed from Ranchi to Perth for the birth of his second child, missing the three ODI victories that delivered Australia a history-making series win over India.

The right-armer estimated he slept for two of the six days at home before packing the suitcase once again and linking up with the ODI squad in Dubai.

Coulter-Nile now has five one-dayers against Pakistan, starting with Friday's clash in Sharjah, to remind selectors why he should be part of Australia's 15-man World Cup squad.

It's been an eventful six weeks for the West Australian, whose preparation for the tour of India was overshadowed by a worrying vertigo episode during a BBL game that led to him being put on an IV drip in hospital.

"I saw a vestibular physio and an ear, nose and throat specialist but they didn't really give me much," Coulter-Nile told reporters.

"I didn't get a chance (to investigate it further). I had the vertigo and left for India a week later.

"So I'll get through this series, go home and try and really - I want to know the cause of why it happened. Because if I can stop it I will."

The 31-year-old's previous vertigo episode came eight years ago when he was sitting on the couch at home.

"There were no similarities between the two. It was just unlucky," he said.

Coulter-Nile's career threatened to be derailed by a stack of untimely setbacks, including a hamstring injury that ensured he played no part in the 2015 World Cup.

The fast bowler, who has previously admitted missing the 2015 tournament was "absolutely shattering", feels he is now training more smartly and also a more consistent bowler.

The rewards have come and now Coulter-Nile is in the mix to be part of Australia's World Cup defence, especially with Mitchell Starc and Josh Hazlewood both in doubt because of injuries.

"You're driven to play every World Cup, and not just play it but win it," Coulter-Nile said.

"The World Cup is always going to be spoken about. It's around the corner, people are vying for selection.

"But we're just focused on winning this series like we won the last series. Hopefully we go into the World Cup with some form and we can play well."