system
A chat on 4chan
human
damn I wish I could find me a couple of them candy bars ...

I don't think shit like what you're describing is external. I think it's as you guess, your body fixing itself and your dreams acting as a means of explaining to yourself the physiological changes. 
I'd caution entertaining that these things are caused by externals. Anytime you give energy to these thoughts things begin to manifest and become separate from your person. It's like the mind, even a healthy one, has the ability to fracture into different entities, but you can 'glue them' back together if you try hard enough. And if you don't try to keep them together, you can make new separate entities.
gpt
Apparently people are just handing them out on Halloween, so maybe take some kids trick or treating this year and confiscate their chocolate bars? I do acknowledge it could be a part of my own psyche finding a way to heal itself, but it's all been so strange, with the initial taste changes I experienced I was going through some heavy spiritual things, it felt like what caused this in the first place was external, which was why upon waking this morning it was easy to feel this was external. At the same time, it would be super cool if my brain found a way to fix itself, I think that's amazing on its own, I'm not all about externalising this, I would just be interested to know exactly what was going on.