Very raw and obscene question...but it is 100% serious. Preferable mental health experts only please?

Ok. This is a question concerning the mental health of my girlfriend. I am a 26 year old guy and my girlfriend of 9 years is 28. We have never been sexually active for 7 years now, so I know what she likes and doesn't like, and vice versa...at least up until last night, when she scared the hell out of me... show more Ok. This is a question concerning the mental health of my girlfriend. I am a 26 year old guy and my girlfriend of 9 years is 28. We have never been sexually active for 7 years now, so I know what she likes and doesn't like, and vice versa...at least up until last night, when she scared the hell out of me with her total flip of wants. In my opinion we know each other more than we know ourselves. We have never been away from each other more than two weeks since we got together. We are madly in love, we never get sick of each other, yeah we have our fights but every couple does. Anyway. About my girlfriend.

She is 5'8, around 115 pounds, dark brown hair and blue eyes, if that even matters. I don't know what mental health experts need to "diagnose" a person. I am to embarrassed to go to a doctor face to face. This answers thing is my last resort.

She is a dominant woman. She knows what she wants, and she thinks before she acts. She is independent when it comes to making it on her own, but needs the love of a relationship to be happy. She is very smart, she is a nurse's assistant and was always an honors student in middle and high school. She has only smoke pot one time, has never drank alcohol and was not abused as a child. She has a healthy diet and exercises every single day for two hours minimum. Her parents were very loving and caring, actually. She has an older and two younger sisters, and no brothers. Her mother was a dentist and her father was a Major in the USMC. They both looked out for all four of their kids like no other parent.

Sorry this is taking so long to get to the point, but like I said, I don't know what people need to make a diagnosis.

Anyway...I took her out to buy a new dress yesterday, because I had made reservations to a very, very fancy 5 star restaurant. We ate, came home, and cuddled on the bed while watching tv. We started kissing, and it got real heavy really fast. She pushed me down and sat on top of me, and tied my wrists and ankles to each bed post. I thought this was an odd turn for her, because usually she is the one that likes being submissive. But then, she got completely naked, and sat on my face! She started giggling when I tried to get away, because she basically cut my air supply off and I couldn't breathe. Plus it was gross as hell, I mean, her butt was ON my face. I was so grossed out. She moved forward and looked at me, smiling, and I was basically begging her to stop and telling her that I wanted to be untied NOW and it was just awkward as hell. She frowned and sat on my face again, and said that she was just getting started. She sat there GRINDING my face deeper and deeper into her butt. She was moving back and forth demanding that i sniff and lick it. I seriously gagged, I was grossed out to the max. I couldn't get the damn ropes undone either, she tied them so good. She got upset that I was not excited and got even more upset when it remained like that the entire time. She got "hers", though. That went on for over two hours. She varied position from time to time, but that doesn't matter. Basically, what the f*ck got into her? What the hell is wrong with her? She has NEVER acted like that before! She has almost always been the submisive one. She says she likes strong men that "show her the ropes". After she stood up over me I kept saying untie me untie me now and she FINALLY did. I imediately ran to the bathroom and locked myself in so I could throw up and wash my face and get the smell of butt out of my nose. I am getting sick just thinking and typing about it now. After I got out she smiled, SMILED and asked how it was. I couldn't even talk to her I just went to bed, horrified. Seriously, what the hell happened to her? I don't understand. The weirdest thing happened so fast. It was disgusting, but she LOVED it. Please only mature people answer this, I don't need answers that put me or her down or tell me to leave her or what ever. She is my life and I love her to death, I am just worried. Thanks in advance for the answers.
Update: Not never been sexually active for 7 years, we HAVE been sexually active for 7 years. Sorry.
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