I'd be more concerned with the dairy than the sugar.
tl;dr - Eating meat and fatty foods may lead to excess estrogen in the body, which can cause endometriosis pain to flare, while fiber—found only in fruits, vegetables, grains, and beans—may help reduce pain by flushing excess estrogen out of the body,” says Hana Kahleova, MD, PhD, director of clinical research at the Physicians Committee for Responsible Medicine. “Seaweed may also help suppress estrogen levels.
https://organicvegansuperfoods.com/the-benefits-of-a-vegan-diet-for-women-with-endometriosis/
tl;dr - Common suggestions include increasing your intake of omega-3 fatty acids, reducing your intake of dairy and red meat, and eating more dark leafy greens and whole grains. Some women also find that eliminating gluten from their diet helps to reduce symptoms.
Studies have shown that egg consumption is associated with increased discomfort for women with endometriosis, and a high estrogen content in eggs may play a role in this.
The second link has a lot of information about the link between eggs and endo. Definitely worth a read and I'd be interested in more studies to see where the truth lies.