The captain and talisman finally prised open the Swiss defence deep into extra-time, two minutes from penalties, and picked out Angel Di Maria for the game's only goal.
And he said the nail-biting win, in front of tens of thousands of Argentine fans, could stand his team in good stead later in the tournament.
"Suffering, suffering that's what I felt, but now we know we can go through times like this," said Messi.
"We were lucky, we had luck on our side and now we have to take advantage of it and move on."
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"Just like everyone else, I imagine, at times I was nervous because we couldn't score a goal and any mistake would have put us out of the World Cup," Messi said.
"We didn't want penalties and so we wanted to win it in extra-time.
"For the goal I thought maybe I should take a chance. And then I saw Angel on the right and I passed to him and fortunately we were able to score."
"I don't know whether I deserve this one (award) or not but what's important is that we've made it to the next stage, which is what we wanted," Messi said.