Well if what you eat is giving you the results you want then that's most important.
As for feeling sick after eating a pizza and candy (is that what munchkins are?) it maybe related to other factors. I'm sure many people have had an irritable response in eating a food that they have abstained from for long periods of time.
FWIW I had a few days of discomfort when I went from being vegetarian (yeah that was me in 2001) to not being one (2004ish). Felt discomfort when scaling down carbs and switching up protein etc.
For OP, I'd almost want to say clean/not clean has nothing to do with why you're "slipping into a coma" as you put it but again more to do with eating a food that you haven't eaten in a while. And while eating fast food, sweet food etc is most likely a contributing factor to obesity/onset of diabetes etc it's almost definitely due to the volume of food consumed and in most cases a sedentary lifestyle.
But hey, if this experience forges you forward to continue eating cleaner and looking great then by all means continue.