If you fished that much... even if you turned all the fish into sand. That's a lot of sand. If you turned it into Fine Sand. Go sell it to some Alchemists(if I remember right) as it's needed to turn crystals to shards.
The game hates you and now that it's got you by the ****s it feeds on your misery.
On another note, i found that doing the levequests with a group instead of alone will get you 1-3k gil per quest with just 2 or 3 people in the party. So find a friend or someone around your rank and go!
Been playing FFXIV Beta? Think it's too complicated? Things are not going your way?