Actually, the whole issue of debris/space dust becomes interesting if you think about how the warp bubble works, because the ship isn't actually moving within the bubble. The question then becomes, how is the debris and other such matter affected as it enters/leaves the bubble?? In any case, that's what the Main Deflector Dish is for
As far as G-forces... that's what inertial dampeners are for.
And lastly... be sure to carry your BCAA card.