dear friend , thanx for sharing you concern,
as you have mentioned , extraction was done eight days ego so by now the wound must have started healing and hence less pain too. but in you friends case its not so . that means he has dry sockets or dental alveolities.
that is a painful condition in which the clot gets dislodged and the wound does not heal properly resulting in excessive pain .
my advice to you is please visit your dentist
and ask him to examine the case again. if the pain is due to dry socket it can be well managed again.
please , don't take lots of pain killers and antibiotics without consulting your dentist.
try and take semi solid food and plenty of juices .