Post PRK: eyesight keeps regressing drastically after 8 months of correcting high myopia, what may be the cause?

Hi, undergone PRK op (-10, -10) in June 2018 in another country, I cant see the surgeo now, but after 8 months since surgery my eyesight started regressing so drastically and quickly, in Feb I saw a general ophthalmologist they said my vision in -2 and -2.5, but he did not give much information and he said my eye pressure was 18 and it's fine my eye sight keep regressing it's hard to get appointment with specialist, have you ever seen such this fast regression? what could be the cause?