The championship leader had his right leg run over by KTM's Brad Binder in a horrible accident in last week's Catalan GP.
Though he was cleared to ride, Bagnaia struggled with the pain in his leg in Saturday's 13-lap sprint race and only narrowly fended off the KTM duo of wildcard Dani Pedrosa and Brad Binder for third.
Bagnaia says his defence of Pedrosa into Turn 1 on the last lap was one of the hardest braking moves he has ever made because it was "too important" to get onto the podium after what happened last week.
"He [Pedrosa] was pushing a lot, I was hearing him," said Bagnaia, whose points lead has been cut from 50 to 45.
"The braking I did in the first corner on the last lap was one of the hardest for sure, because he was already in front of me and it was too important to restart with a podium from [what happened in] Barcelona. Much more than this was very difficult."
Expanding on how he felt physically in that race, Bagnaia said: "Quite bad, right now. Tired, really tired. I need some rest for sure.
"But we were expecting it, I was expecting it and the soft rear tyre was not an easy solution for the race because it made the bike more nervous, it was shaking more, and it was difficult to have a rhythm.
"In any case, I'm happy with the result considering where we were six days ago. I'm so pleased and proud for the result we achieved."
Source: Autosport