This is Dr. David
I am sorry you are in such pain.
your doctors should have done an ultrasound before the surgery to confirm the hernia vs cyst diagnosis before the surgery.
yes, it is common to have severe pain after surgery, even for a cyst removal.
you should be icing the surgery area which can also help decrease pain.
the inguinal area is a very sensitive area with a lot of nerves which run through there.