I figure it could be one of many things, or all of them. My first reaction would be your seeing your darker aspects manifest outside your psyche. It sounds crazy and far-fetched, but the mind to be able to create an entity of sorts is not unheard of.
It could also be demons, which is another far-fetched idea. Have you seen Constatine? That movie does a remarkable semblance to real demonology. In it they have what they call Soldier Demons, normally they are called the Legion. To get through to earth, they must inhabit a human body and "break through", as a human can be the medium between both planes.
Then you have incubus, which would be the most logical solution in relation to demonology. Incubus prey on women, particularly vulnerable women. Under normal circumstance, an Incubi would inhabit the body of a man familiar to you, and do his deeds through him, but in this case, it would seem he is obviously not strong enough to inhabit, and brought you into his realm to attack you.
Your nose and sex bleeding are signs of extreme stress (obviously), and adrenaline, the latter being more rare. The bleeding can be a psychological stress, but it is not uncommon for the spiritual stress on afflicted parts to leak into the physical. Pretty straight forward.
If it is your psyche, I HIGHLY suggest doing alot on internal work, through meditations and even counselling. There could be some deep-seeded problems that need to get rid of.
In the event of a demon, I'm going to break away from the boards mainstream magickal practices, and suggest a good old Catholic excorsism. Now a days, you don't need to be a Priest or Father to perform them, the loophole being you where baptised as an infant. You can acquire Holy Water from any Catholic church. I can give you a simple one, and if you can remain open to Catholic ways, it's pretty much a given that it will work. It may have to be performed more than once to completely eliminate it.
ExorcismI wish you much luck, protection and peace. You'll be in my prayers.
If you have any questions at all, please do not hesitate to ask.
Namaste