Got my flu shot last friday and didn't feel any pain in my arm.
I take shot every year for last 10 years and it is something I forget 5 min after. Only for the first time I was in bed for 2 days, arm was fine, but I had a fever.
...somehow I don't think the question was "who didn't feel pain after the shot", nor did you say which arm...
That's like someone asking a question about something and getting a response of "I don't know"...worthless...nobody wants to know what you don't know...