diop Thanks for the reply @diop. Placebo is such a difficult thing to account for, but these were entirely new symptoms to me - I was probably expecting a migraine or at least a nauseus headache (which I did have in the morning) and initially I hadn't even thought to connect the dots between the temporal dithering and these surreal experiences.
However after a bit of reading about them potentially being a mild form of epilepsy it made me think that perhaps they're related, and having since read @screenjunky's post regarding epilepsy I'm starting to wonder if there is perhaps a strong link here:
https://ledstrain.org/d/657-everyone-here-needs-to-get-an-eeg-test-for-epilepsy