BIN lorry crash driver Harry Clarke asked medics "have I had a heart attack?" as they attended to him minutes after the tragedy.
Off duty staff nurse Lauren Mykoliw rushed to the aid of the bin lorry driver after hearing a loud bang.
She found him in the cab, conscious and with his seat belt on.
It had crashed into the side of the Millennium Hotel after Mr Clarke lost control on Queen Street and the lorry ploughed into pedestrians.
She was giving evidence as the Fatal Accident Inquiry into the bin lorry crash which left six people dead resumed for the fourth day.
She told the inquiry: "He was pale, he looked shocked and a little bit sweaty.
"He asked me if he had had a heart attack." She told him she couldn't determine this.
Ms Mykoliw, 28, said Mr Clarke said repeatedly that he didn't know what had happened and said he told her that he didn't know if he had passed or blacked out.
He did not complain of pain and said he "seemed well" given the circumstances, she said.
The nurse, 28, spotted unopened beer bottles in the cab and asked Mr Clarke if he had been drinking and he said no.
The driver was then helped out of the lorry by firefighters, the inquiry heard.
Paramedic Ronald Hewitson, 52, treated Mr Clarke on the ground beside the lorry.
He said he checked his blood pressure, oxygen saturation levels, blood sugar levels and did a heart trace and all produced normal results.
The witness said: "He seemed slightly confused, slightly pale and I asked him if I could do checks which he agreed to."
He added: "Everything seemed to be fine he was still talking but slightly confused."
Mr Hewitson said: "Further on he asked if he had had heart attack or some sort of event which at that point I couldn't classify."
Mr Clarke told the medics that he could remember being at the lights before the crash and told Mr Hewitson the next thing he remembered was someone "shaking" him afterwards.
Mr Hewitson said that Mr Clarke told him he had eaten lunch and that he had "a Pot Noodle, a Mars Bar and a can of coke".
The inquiry, which started on Wednesday at Glasgow Sheriff Court, has set out to establish the circumstances of the tragedy.
Erin McQuade, 18, her grandparents Jack Sweeney, 68, and his 69-year-old wife Lorraine, all from Dumbarton, died when a bin lorry lost control in Queen Street and George Square on December 22, last year.
Stephenie Tait, 29, and Jacqueline Morton, 51, both from Glasgow and Gillian Ewing, 52, from Edinburgh, were also killed when the truck mounted the pavement before crashing into the side of the Millennium Hotel.
The council bin lorry was being driven by Henry Clarke, known as Harry.
Witnesses reported seeing him “slumped” over the wheel, unconscious, as the runaway lorry ploughed into pedestrians.
The inquiry heard on Friday, from technical expert Philip Balderstone, that the handbrake in the lorry could be reached by a back seat passenger.
But it was “difficult” to do so with a seatbelt on, he said.
And it depended on the size of the person making the attempt.
Watch The George Square incident as it unfolded:
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