Eat ice cream, then go back to it 😉
(referencing your comment in another thread)
Seriously though. Your goal with studying is to
A- master the information
B- prepare for the exam
If you feel that a single topic is driving you insane, perhaps sacrificed the 'prescribed learning method' in favor of something else, even if it doesn't fit your exact blueprint, for the sake of keeping up your motivation, keeping down your hatred for the material, and moving forward.
Perhaps even come back to the side notes later in the day or another day so you don't feel 100% guilty skipping it