don't play outside of your bankroll. once you are rolled then maybe ease your way into the next limit by playing just 1 table at the new limit (i assume you multitable) and/or maybe 1/2 stack til you get more comfortable with the bigger pots. don't think of the money in terms of "i could've bought X with that money." think of it in terms of big blinds only.

oh ya and welcome to ftr!