check out my current Op thread "bode's still treading" and my old Op "Operation Quicksand." I started the year at $10nl and you can see some of the struggles ive had moving between limits. my new Op especially illustrates this point as ive moved up to 100nl 3 or 4 different times only to have to drop back down.
keep your head up and realize that there is a marginal difference in the player pool at these levels. good luck.