I think the campiness is part of why it works so well as horror. The Upside-Down is "nightmarish" in the conventional sense of "really horrible", but it's not actually like something you'd see in a real nightmare. Not any I can remember, anyway. Whereas the Black Lodge, in fact all the more horrible scenes in Lynch, has a true hint of nightmare or hallucination about it.felt more true to life. the black lodge is just a bit of silliness. comedy dwarf cavorting about speaking in a funny voice.
Eeech. I know this feeling - happened the first time I did mushrooms. I assume what you've got is a far milder version of that, or you'd be totally non-functional. Sounds shitty all the same and I hope you can eventually get past it.If you've ever seen Being John Malkovich, it can feel a bit like that.... like I'm a passenger in a body and sort of watching what it's doing from inside.