For many reasons the name of your Lasik facility was edited.
This is indeed an unusual situation. Your pre-surgery refractive error was very high. Regression after such a large change would be expected during the normal six month healing period, but not six years later.
I'm surprised that your doctor suggested your flap could not be lifted. Lasik flaps can be lifted (more like separating the cornea at the location of the original incision) as much as 12 years after surgery. It may be that the flap should
not be lifted. By having PRK and using the laser to remove tissue on the flap, the strength of the cornea would remain virtually the same after enhancement surgery.
The doctor undoubtedly used Mitomycin C with the PRK on Lasik flap. Mitomycin C is a medication that changes the way the cornea heals and reduces the probability of corneal haze developing. It may be (I'm speculating) that Mitomycin C changed your healing response and this resulted in the current myopia (nearsighted, shortsighted) vision.
Alphagan P is a glaucoma medicine that has a side effect of reducing the size of the dilated pupil. A drop in the evening is often used to reduce night vision problems. It is possible that the Alphagan P is reducing the size of your pupil to allow only light that is undercorrected to enter your eye and be "seen". It may be that a larger pupil that allowing light refracted through a larger portion of the cornea would provide better refractive error. Again, this is just speculation.
Restasis is an anti-inflammatory that is FDA approved for the treatment of dry eye. Dry eye can cause edema (swelling) that can contributed to myopia. You may want to review our article on Lasik dry eye