After experiencing severe symptoms, Pacioretty missed only the first game of the Eastern Conference First Round against the Ottawa Senators after not playing in Montreal's final two regular-season games.
The Canadiens were eliminated in the second round by the Tampa Bay Lightning with a Game 6 loss Tuesday.
"When it happened, it was pretty bad at first," Pacioretty said. "The first two days we were still in Florida, I was locked down in my room and luckily I had my dad there. My family lives down there so my dad was at the game and he drove me home. As soon as the sun went down we would go outside for the next two days and eat outside.
"He was very worried about me and that was tough on me, and kind of made me take a step back and think about my family and stuff. But I had very bad symptoms for two or three days, but as soon as they went away I don't think I felt anything significant."