headache causing parasites?

i wonder if it was the yeast in my system or something else.
i do have indoor cats. i wear gloves when scooping the box.

anyway i am totally free of my migrains i havent even had a baby headache since my cleanse. (beginning of summer)which usually i was having headaches at least 3-4 days out of the week.

do you think it was from:
- parasites other than yeast and what are they?
-just the yeast?
-cleansing of my digestive tract?