I had a similar aura last year and am now treated for 'non-pain' migraines (although I get the pain migraines too). The visual aura was very difficult to deal with because it rarely went away. I called it 'contrasty vision'--blurry but more so just hard to focus--made me feel lightheaded and drunk as you noted. Bright warehouse lighting like at Sam's club and other stores made it worse. My inability to concentrate and focus at work was the worst part--I felt like I had lost all my brain cells. I couldn't think anymore.
I took Nortriptylene for several months but it made me drowsy and I had a hard time getting up in the morning. Now I take Venlafaxine (generic for Effexor) and I feel good. Effexor is an antidepressant but I am on a really low dose and it helps.
If you are in the Chicago area and looking for a neurologist I highly recommend my doctor.