I do not know what you have and the fat that I am not girl may make a difference in my answer. All my life I've been a nervous person and this has causes me a terrible problem. When I get super nervous my lower left abdomen pain intensely, like if there were a knife trying to cut through. Well over time I have figured that this is caused from my nervousness and that, what I believe is my small intestine, bloats and stretches, therefore my pain. I don't know if this is any help, but I have a pain similar to yours. If you are a nervous person, I would advise to control yourself on your emotions as I have. This is the only way I can prevent the pain. But if you are not a nervous person, than you might have a cyst in your ovary as someone wrote before. You might want to buy a magnetic therapy bed. I saw on a Spanish channel that they can cure these illnesses if not too advanced. I would have bought one but am under age and don't have money. Might help? don't know.