The 17-year-old says she can't really go out and has no friends any more because she's "always in the house".
She's seen eye specialists, gynaecologists, haematology experts, neurologists and paediatricians to try to find the cause.
"It burns and then if it covers the pupils of my eye I can't see," she tells Newsbeat.
The mystery condition also affects her ears, nose, gums, scalp, fingernails and tongue.
Marnie-Rae Harvey
It all began when the teenager, from Stoke-on-Trent, started coughing up blood in March 2013.That continued for a couple of years until she woke in the night in July 2015 with her face covered in blood. She was bleeding from her eye.
Her parents called an ambulance. "The paramedics were just shocked because they've never seen it before," she explains.
"When I got to the hospital they looked in my eye but everything was clear.
"They can bleed and it can cover my face with blood and in seconds it's just gone completely white back to normal.
"I had blood tests and they came back fine."
For the next two weeks her eyes continued to bleed every day.
Marnie-Rae Harvey's ear
"Then I was in the shop and both my eyes and ears started pouring and then we had to have an ambulance again."
Marnie-Rae had multiple tests, saw more specialists who found she had a "weakened" immune system but nothing more.
Haemolacria is the medical term for tears of blood - but it is rare.
Causes can include injuries, clotting problems and tear gland disorders - but Marnie-Rae has been tested for this and she was cleared.
