You shouldn't take any supps or drugs during water fast, as a rule. Further you will probably not absorb them well, as fasting is a cleansing mode not a building mode, even if there wasn't the negative side of starvation which exists anytime you habituate into low-nutrition food (or fast) and give your body only certain molecules. Furthermore iron tablets can be very irritating and straight out caustic to the GIT if taken with no food.
Eye glands also can be overwhelmed with mucus, therefor the cleansing you experienced as sticky eyelids is very beneficial, as Archus pointed out.
Good job.
I also did 36 hrs dry fast and it was amazing in terms of cleansing power! I will be aiming for 48 hrs now.
DL