I have a great problem; I did LASIK surgery 4 years ago and now my eyes are getting worse?

I did a lesic surgery 4 years ago...my vision was -12.5.. after surgery my eyes was good corrections..it was corrected1 1.. then I usin1.5 glasses only..but now a days my eyes getting bad conditions...desrease my vision .doctor gave me 3.5 power glasses...but my vision doesn't stable...it getting decrease...I am so frustated now...I am going to blind..plz give me a suggesrion or step thatt I take and recover my vision...

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