How soon does florinef (fludrocortisone) work? can i take it for only 1 or 2 days for a dizzy spell episode? my doc wants me to take if only for my dizzy spells.

Depends: Depends a bit on the nature of the dizzy spells. Florinef (fludrocortisone) may take over an hour to reach it's peak in your system. This may benefit you if your dizzy spells are prolonged. It they are short-lived episodes, taking the medication "as needed" may not be missing the mark a bit. This is really probably best reviewed with your doctor given your specific situation as "dizzy" can take many forms.