Question about damage to skin after Retin-a? (photos)

I stopped Retin-a at about month 7 because my skin started to drastically change. I've been off now for 5 months. I now have huge pores, sagging skin, open pores (in places I never did before Retin-a like forehead), and this obnoxious shiny texture to my face even directly after I shower. It looks like wax and feels greasy but my skin is not. All of this NEVER used to be my skin texture. Please tell me how I can improve my skin, mostly the shiny texture. Could this be caused by dehydration? Thx

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