There is nothing you can do. It will look horrible for a few days then gradually fade away like a bruise does.
This happened to me a few years back, 3 times in 9 months. I had my eyes checked and the checks below and nothing showed up.
You can get your blood pressure checked to make sure that is not a problem.
If you are bruising elsewhere get a blood test to make sure there is not a blood problem.
I have not had a problem in 4 years now.
Often women giving birth can have this from straining. It does go away. Don't worry about it. You should still get your eyes checked once a year because your Optometrist can often find different diseases through the eyes, so it's not just about whether you have 20/20 vision.