I cant recall seing this among the posts here, but probably it can.
"so maybe I had this already with my right breast and now the cysts have flared up for some reason? (asking for more Iodine or something else?)"
-yes I would take it as a sign of needing more.
It took me a year to get rid of 90 % of my FBD, on MUCH higher dosages than you mention.
The headache is typical for the Iodine detox. Beware that there is a protocol that comes with iodine, like real salt / loading; great for head aches etc.