You could certaintly blow your buy-in quicker in NL, but what I'm reffering to above is not tilting from losing 1 big pot but tilting from losing hundreds of hands in a row where you were a firm favourite until the river.

In fixed limit holdem you are pushing lots and lots of small edges to make profit in the long run, because the edges are so small there are large (and I really do mean large) swings in variance. You also play on pot equity alot more in fixed limit (at least at small stakes) so you may find yourself trying to get as much money in the pot as possible with only a small chance of winning the hand (ie, if the pot is 6 handed on the flop, and you work out that you will win by the river 20% of the time, you want to get as much money in the pot as possible right there). Obviously you may have to make this play a dozen or so times before you start seeing a profit from it.

Bascically, I think you need a much larger sample size in fixed limit before the variance "evens out" if you follow my logic?