Rod Stewart Uses Oxygen Tank During Concert Emergency

 was seen bent over in distress onstage this Saturday, before drawing gasps of air from an oxygen tank to get through his concert.

One week prior, the 81-year-old canceled a show in while fans were waiting in line to enter, citing a respiratory infection that had spiraled into laryngitis.

Less than 24 hours later, however, he flew private to Boston with two of his sons in tow to attend the .

Fans erupted in outrage on social media, with one fuming in his Instagram comments: 'This feels rather disingenuous, especially after your cancellation last night. Too ill to perform but okay to fly across the country for soccer?'

This Saturday, he forced his way back to the stage in Salt Lake City, but in the middle of the show he had to gesture to his staff to fetch him an oxygen tank.

When the device was brought to him, he pulled repeatedly from it, before informing the audience he had 'nearly f***ing fainted,' in footage obtained by TMZ. 

While he was using the oxygen tank, the audience whooped supportively and one member of the crowd could be heard shouting: 'Take a break!'

However, once he was finished taking his air, he turned to the audience and rasped: 'The show must go on,' to an explosion of applause.

Less than 24 hours later, however, he flew private to Boston with his son Alastair, 20, and Liam, 31, in tow to attend the FIFA World Cup match between Scotland and Haiti