I got this same message and answered that I found it difficult to
understand why breastfeeding would cause such severe symptoms.  I have
not heard of anything like this in the several diabetic patients I
have seen for various breastfeeding problems.  In theory breastfeeding
would decrease her insulin requirements.  But then, the answer would
be to adjust her insulin and/or her food intake.  I really don't
figure it.  She did not write back.  She hadn't given any information
about how she knew she was hypoglycemic although she had had several
visits to the emergency, where they presumably would have done a
glucose level.  But by the time someone goes to the emergency,
presumably they have taken orange juice or given themselves glucagon
and the sugar could be normal or even high.  Perhaps she was having
other symptoms which she attributed to hypoglycemia, such as the
dizziness, perspiration, headache that some women experience with milk
ejection reflex.

Jack Newman, MD, FRCPC