It sounds like your stim levels are too high, to me, if you can't handle being in a noisy situation for several hours. Maybe you should have a 'low volume' setting for noisy places?
I wear my CI almost every minute I'm awake, no matter how noisy or loud the environment is. In very noisy places I do turn the implant volume and sensitivity down some, but not a great deal. You could try asking your audiologist for help.
