Hi, I am a new member as I felt compelled to sign up when i read your post.
I am currently 25, but at 21 I was also diagnosed with both proliferative retinopathy and macular odema in both eyes. I too had major blips in my teenage years and had horrendous control (mainly intentionally due to diabulimia tendencies etc.).I undertook the DAFNE programme and my control improved dramatically, which is what sadly sped up my eye issues apparently...! I had a few symptoms, but could still see vaguely okay so was so shocked when I was diagnosed! My diagnosis was also pitifully slow, cancelled retinal photography appointments and very delayed general eye appointments definitely didn't help.
The doctors said I needed urgent laser and that it may not cure the problem... I was so upset and thought my life was over.
Luckily, the laser worked...I did have quite a lot but it worked. I suffered some vision problems for a few more months after the laser, but it went away completely in time. Every doctors who looks at my eyes now always tells me that it's one of the best lasers they have ever seen so i couldn't be more thankful!
In the last 4 years my eyes have been stable, and more recently (due to a sort of realisation that i'm only 25 and never want to go through eye problems again) I have made sure my control has been much better (now at 58, the lowest I have ever had!).
All i can say to you is please don't worry so much and let the treatment take effect, there is literally no reason why it won't work. The hardest part is making sure your diabetes is controlled for ever more, although we are all struggling with that one...!
Hope everything works out ok!