Only part of your medical condition do I understand,
Yes hormones will impact on your control, any fluctuation will effect, Stress, pain etc all causes a hormone response that we react do... Menstrual hormones changes through the menstrual cycle will effect control, in your case how your hormones fluctuate during extended period of bleeding is difficult to know..
About the only thing I can suggest really looking at your data, seeing if any patterns emerge over the length of time a period might last, are they consistent or is there any changes in insulin that associates itself, on days that bleeding gets lighter/heavier etc... which could indicate hormone balance shift.