Watch high potassium foods, as many of them are high folinic foods, which could set off a mixed bag of getting better/getting worse/what is going on?
If you have been doing the FAP for at least a month, are female, and have a heavy period, you could experience a strong potassium drop on cycle days 2-5. Get plenty of potassium ahead.
If you have trouble with folic acid, and might have to consume your methylfolate right before mealtime, as you are experiencing folinic/folic washout, you may have some abrupt potassium "re-startup" type symptoms, which are easy to misinterpret as "detox." Some people have to be VERY careful about timing of methylfolate doses right before meals in order not to bring back neuropathies that may have been gone already. RAGING IBS--diarrhea may be a first clue as to a folic/folinic block of your methylfolate.
Low potassium may feel like you are very nauseated, your head is swimming, or you are about the vomit and float away all at once. You could have heart palpitations, and other symptoms.