Have a very good sleep beforehand, take your vitamins, have a pocketful of energy food, clean your glasses well, sit to play, etc....
Seriously though, even the excerpt numbers that I played recently became a test of physical endurance because I often played constantly for two pages before going back (Da Capo al Fine). Are you the only bass player? Ask the conductor about not playing when one cello is sufficient to accompany the female (and male?) soloists in recitatives or in arias where they enter after the Tutti orchestra introductions. Depending on your edition you might see Vcl. above the stave then later +D.B. + Bsn (bassoon).
Good luck, enjoy and all the best for 2014!!