Is severe eye pain normal 11 days after PRK?

You could try Systane Gel, Genteal Gel, or Muro 128 ointment to lubricate your eye for a few hours before seeing your surgeon.
Most likely, the epithelium isn't stuck down that well to the "meat" down below it. So it might stick to the inside of your lid and then come off exposing the corneal nerves and hurting.
Of course, there are other things so a visit with the surgeon soon is important.

I would suggest that you return to your surgeon ASAP. There are a number of possible conditions that can only be diagnosed with a careful slit-lamp examination by your surgeon. Good luck.