Queen Camilla's relative in rare admission about 'agonising' and 'unbearable' pain

was praised by her niece Ayesha Shand, who opened up on the level of support she received from her royal relative . The 30-year-old marketing executive described the Queen as "incredibly intelligent, really funny, and very compassionate", saying that she has supported her throughout the struggles of her condition.

She told the during the 13th Annual Endometriosis Foundation of America's Blossom Ball in New York: "I'm very close to my aunt. She's been very supportive of my journey with endometriosis and has been really helpful and always listens to me." The daughter of the Queen's brother, Mark Shand, removed lesions in her pelvic cavity about a year ago after consulting several doctors who told her she didn't have the condition.

She described her ordeal: "I spent seven days in bed a month, unable to walk, passing out, vomiting, the works."

Endometriosis is a long-term condition and occurs when tissue similar to the lining of the uterus grows outside of it.

Unlike the tissue inside the uterus, which sheds during menstruation, the tissue growing outside has nowhere to go.

This leads to inflammation, pain, and, in some cases, scarring. Endometriosis can affect various organs, including the ovaries, fallopian tubes, bladder, and bowel.

Symptoms of endometriosis can range from mild discomfort to severe chronic pain and infertility.

Last year, she posted an emotional video about herself and shared that her diagnosis means that she is in "agony" for hours, as well as experiencing symptoms like fainting and vomiting.

The 30-year-old captioned her video: "This is what endometriosis looks and feels like. It's isolating, agonising and completely unbearable."

Last week, she opened up about her time with the Queen and said that most of it involved reading and walking.

She said: "When I was younger, we used to read a lot together. She's actually a patron for a lot of reading organisations.

"The Brits, we love a walk. That's one of the main things that we do. Walk the dogs, that kind of thing."

She said that following her surgery, she's found a new sense of renewal.

Ms Shand explained: "Now I feel totally free. It's like I have a new lease of life. It's amazing."