My vision after PRK surgery has worsened and worsened. It's been 5 months and I need glasses again. Is this normal?

You had a high prescription.   Even though the enhancement rate (retreatment) is less than 2 percent for most surgeons and surgeries in your group it may be double or triple that rate.   As long as glasses corrects you to 20/20 it is likely that with an enhancement yiu will do well if your cornea is thick enough.   I prefer PRK over LASIK in the rare cases when an enhancement is necessary and prefer one eye at a time as your eyes did not respond predictably to your first treatment.  Water under the bridge now, but an ICL is a great option for people that are in your prescription range.  I agree waiting for 6-12 months or more is the best option to insure that your prescription is stable.   Make sure they do a cycloplegic refraction pre enhancement.  It is possible that you are accommodating and if treated based on your manifest refraction only may result in yet a third treatment or put you back in glasses or contact lenses.   Generally, one enhancement will yield excellent results.   Make sure you are not rubbing your eyes as this can result in warping of your cornea and poor vision.   Best of luck!