Good luck!
While I'll give the short version - essentially, I had the same pair of glasses from age 14 to my late 20s. I tried getting new glasses several times - but I always had to get a refund. I never could adjust to any other set of glasses... I'd get dizzy, headaches, and everything seemed warped at the edges of the glasses.
I always checked on the refund policy before I tried each time - because I figured it wouldn't work.
Around 1998/99 I gave it another shot. Finally got something that worked right away. I thought "great." Then, 2 months later - I started getting fatigued easily, trouble concentrating , getting "spaced out" sometimes, headaches, seeing spots, etc.
Even with insurance, all the tests costed quite a bit of money. EEG, sleep study, cat scan of the brain, etc. Nothing could be found. Also given all sorts of prescriptions that had no effect.
On one Sunday when I had a headache, took a nap, and woke up with it - I took my mom's suggestion that day to try putting on my old glasses. Symptoms went away in 1 hour!
Now, I had initially asked the neurologist ion the very beginning if he thought that it could have been the glasses - he told me no.
My old prescription was too weak, so I basically juggled back and forth between glasses as needed. Over time, the symptoms went away, but I still get a flair up on a rare occassion.
I had to get another pair in 2003, because my eye sight got worse. Same deal. I ONLY wear those at the shooting range now.
What's my point - well, it seems that my brain just won't adjust to a stronger prescription. The neurologist told he never saw anything like this before - and he suggested eye surgery to correct my eyes permanently. I decided that was a stupid decision in my case.. What if these symptoms still haunt me because of the surgery... I could never go back then....
Anyway - good luck with that - you shouldn't have near the issues I have :x