The tough Irishman awoke feeling ill on the morning of the Magpies' game in the Black Country with West Bromwich Albion, and admits that he feared the worst, as memories of his collapse a decade ago whilst managing Wimbledon at Sheffield Wednesday in the Premier League came flooding back to him.
"What happened in the hotel that morning brought back nightmares from the last heart problem I had at Wimbledon," he told The Newcastle Chronicle.
"It was quite harrowing again for me and you do fear the worst.
"It happened on March 3, 10 years ago, and those awful memories came flooding back for me. I will never forget that day. But this time I was in control of things a bit more because of my experience.
"At Hillsborough they stabbed me in the heart with adrenalin and I was in a coma for two or three days. It doesn’t get much tougher than that but I came back and got on with life.
"It’s the same now. I have to fight back from this and I’m confident I will."
Kinnear is in good spirits though as he plots his return to the dug-out, and went on to reveal that his desperation to get back into the thick of things is leaving him a little frustrated.
"They tell me that after a triple heart bypass, you are a better person for it," he added.
"It’s like going and getting a brand new engine put into your car. I hope I get back and start running my life as normal. I just want to get back to Newcastle and get on with the job.
"I miss it like hell. Fingers crossed I’ll be fine on April 6 and get through the tests. They might tell me that I can’t go on the line for the Stoke game but I will then hope to be in the dugout for Tottenham.
"By then who is to say how many points we’ll need. There is no reason why we can’t pick up points against Arsenal and Chelsea."
Kinnear will see his specialist in three weeks' time, and may then give his decision on whether to accpet the offer of a permanent two year deal at St James' Park which owner Mike Ashley tabled just prior to the manager's illness.
"The big decision time will be in the summer. First I need to keep Newcastle up and know I am going to be fit enough for the job going forward," Kinnear explained.
"If all goes to plan and I continue to make the same progress, I’m assuming the specialist will give me the OK and it will be all-clear for the Tottenham game on April 18."
Zack Wilson, Goal.com