Most neon transformers have a grounded center-tapped secondary, so the shock voltage should have been 4.5 Kv. In theory, that alone would halve the current to a max of 15 ma.
Unless you are caught between points of opposing voltage (such as two transformers), there's no way you could conduct more current than the source can supply; simple Ohm's Law.
The resistance of your body also reduces the current. That you are alive and kicking indicates that the current you were subject to was probably below 5 ma, but it's a guess.
