The odds are overwhelming that your fever
10 days later are due to something other than HIV
. Among other things, fever
due to a new HIV infection lasts at least 1-2 weeks, and acetaminophen (Panadol and other brands) wouldn't have any effect on it. It is not possible for fever due to a new HIV infection to last only a day. And lymph node inflammation due to HIV doesn't cause armpit pain.
So no worries about HIV. Of course, if you remain concerned, you are free to be tested.