I was just reading about endometriosis the other day and I found that it is known to cause painful periods, digestive problems including gas (if it is intestinal endometriosis, where cells of the uteran lining begin to migrate to areas of the GI tract), dizziness and clumsiness around the time of your period
, severe cramps
, bloating, etc. and roughly 10 percent of women have it! That's a lot...
Here are some links: