I deal with it. I have 4 siblings so schedules aren't an option,however when I have one if it changes I sometimes go into full meltdown. I'll be sobbing and yelling at people and I usually don't snap out of it until my Mom either grounds me for a month (yes, take that literally - I was once grounded over Christmas Break!!) Or fines me til I've lost 50+ dollars. Yeah I have no diagnosis and my mom would still have similar expectations even if I did. 
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Billy was a chemist's son, but now he is no more, what he thought was H2O was H2SO4, HEY!