Roberto Mancini's side looked set to let slip a first title in 44 years on the final day of the season, with bitter rivals Manchester United on course for a record 20th crown as City struggled against embattled QPR.
However, things at the Etihad Stadium are never straightforward and late goals from Edin Dzeko and Sergio Aguero helped turn round a 2-1 deficit to rescue City - much to Hart's relief.
"I was a lost soul at 2-1," the City goalkeeper said. "I totally didn't know what to do.
"I was on the pitch, but I had no input whatsoever over what was going on.
"I was trying to get myself up front. It's a good job I stayed out the way because I would have probably got in the way.
"When Edin scored I thought we might get one chance, but the way things had gone I thought 'so what? Someone will block it or something'.
"And then it went in and I don't really know what happened. I had to look back.
"I was just a fan on the pitch willing the ball to go in the goal and when it did all hell broke loose.
"Football-wise it was the worst and best that can happen to anybody, definitely. I was lost.
"I didn't think we had lost, but, personally, I was lost because I didn't really have any direction or input in the game.
"Luckily the boys pulled through and it just felt - well, I don't really know what it felt like."
England team-mates from the red side of Manchester are also probably still trying to get their heads around the season's finale.
Hart revealed he has spoken about it with England team-mate Rooney, but will not be aiming any playful jibes at the striker or any other of his United team-mates.
"I've watched it a couple of times since because I wanted to know what happened," he said. "I didn't know. Apparently we won.
"I haven't watched it with Wayne - that wouldn't go down too well!
"It's not something you banter about. I wouldn't want it bantered about to me. We talk about it, but no, no banter.
"It means the world to them, just as it does to me so it's not a nice finish for them."
Now City and United's English contingent share a common goal as they go in hunt of English glory at Euro 2012.
Hart is enjoying his time under the new regime, especially as Roy Hodgson's coaching staff are getting his name right - Fabio Capello's goalkeeping coach Franco Tancredi had called him 'John' throughout his time with the Three Lions.
"I just ended up saying it to myself - 'my name's Joe'," he said with a smile.
"That's just a bit of banter but they did call me John.
"It kind of killed it when John Ruddy came in.
On the arrival of Hodgson, he added: "He's bought something new.
"I've been working Italian-wise for however many years, but there's an English feel. He's got things he wants to get across.
"It will be a gradual thing but hopefully we'll be right for the France game."
Many are predicting Hart will shine at the Euros and some are even likening him to Spain's Iker Casillas - a goalkeeper widely considered to be the best about.
"Things are so easily said," Hart said of the comparison.
"You can be as good as Casillas but then when things go wrong you are overhyped and a waste of space and they need to replace you.
"That's the balance and that's how I look at things.
"I know I have loads to learn, especially off people like Casillas, and [Petr] Cech has done wonders this year.
"Even off the young goalkeepers like [Wojciech] Szczesny and [Tim] Krul, and even [Michel] Vorm.
"You just cant stop learning. You just have to look after yourself and keep playing."
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