How common is it to be this over corrected? Will my vision get better?

It is not usual to have some image ghosting early in the healing period. This can last 2-3 months. If it persists after that period then a wavefront evaluation to detect aberration in your focusing would be indicated. Custom retreatment could then address the issues. 

It is normal for the vision to fluctuate after PRK. I would still recommend seeing your doctor to make sure the eye is healing appropriately. 

Wearing the glasses corrects the small leftover prescription so you will see better with that without them.Wearing them won't compromise the healing. How steroids drops are used after PRK can help or hurt the final outcome. Make sure you get monthly follow up with the surgeon for a few months.