1 week before your cycle, or every day if you can manage it: 1 gigantic red papaya, about 1.5 kilo worth, plus 1 tablespoon or more of the seeds. Or 20 kiwi fruits, or 1 liter pineapple juice. I think this will work better than Iodine for your pain.
Or a high daily dose of wobenzyme. Fruits are better though.
Fibroids are related to protease deficiency.
If you want to get messy you make a poultice of ground papaya seeds and apply over the painful area.