bass problems

woot. i tried doing some simple bass solo, the slow and funky kind, and manged to put some groovy thingy in it. kind if glad man.
been listening to aeroplane by rhcp. lol. freaking childish way of singing, but kind of fun. however, the music, wahlao... power, i haven't even get to play it nicely yet.
unfortunately, i my bass went from bad to worst. i think i either some action problem from my bridge or wrong string gauge. super irritated. at first, i can't play the 19th fret, not i cant play the 12th fret even though the neck don't seem to warp as much as the "19th fret problem" from my point of view.
NEED A SOLUTION FAST!