You have options.

1) Platform Shoes / Spike Heals. 3″ spikes are fairly standard these days but I would really like to see platform shoes return. You could wear them with those bitchin’ disco pants you like so much!

2) You ever see Gattaca? Yeah, you probably wouldn’t enjoy this procedure so much but it does the trick….

3) Hypnosis. Lets stick with the movie references and say Shallow Hal. Yep, you to could be brainwashed into thinking you were taller. I mean it would be hilarious watching you duck all the time, but perhaps another 3″ is not that much and the increased confidence would be well worth distorting you reality.