HOCD is destroying my life

I have always been a good kid never worried about too much. Always lusted after girls, grew up in a loving family. I was very dedicated to studies and would probably say nerdy, considering I double majored in biochemistry and biophysics in college. I have always been very reticent and shy, never had the balls to go and talk to a girl for fear of rejection and have always had low self-esteem and negative image looks wise. My senior year I had a couple of friends suggested I was probably gay cause I wouldn't dare talk to a girl I was interested in, I just laughed it off. However I know my current OCD probably stems from this because I can't think of anything else. I was also a virgin then and so when friends found out about this I would always get humiliated which would even lower myself esteem. These thoughts perpetuated through the rest of the year to the point where I could barely look at friends in the face for fear that they would think I was gay. I constantly told myself that there was probably something wrong with me and that I was gay for at least not going after a girl I liked. My senior was filled with anxiety, had always been an excellent student but my senior year, if you looked at my transcripts, you would see a giant drop. It went a away for a while when I started to take initiative and date a few girls after college and didn't get passed much 2nd dates so I continued to doubt myself. It has been less than a year since I graduated and I have an entry level research position at a medical school, and this OCD is just overwhelming. I constantly trying to tell my brain to 'shut-up' or wish thoughts to go away. Its too the point where I have broken down emotionally and find disgust in having obtrusive homosexual thoughts. I am not attracted to men whatsoever and but my brain keeps telling me that I am and I know deep down that i am not. I stumbled across this website: http://www.brainphysics.com/yourenotgay.php and found temporary relief because that guy described exactly how I feel, the straight one lol. I have also been reading OCD sufferers have depressed levels of seratonin in the brain so I have began taking inositiol, which is a completely harmless natural vitamin. It has worked a little, but I am just in the beginning 2nd week and my doses are still pretty low. I will continue to increase to at least 14 grams for a few months for test run. I am trying to seek medical help, via therapists. I really want to get rid this horrible obsession. I get bad panic attacks and have insomnia some times. The inositol has helped me sleep a little. Can anyone suggest anything else, I am not depressed, or at least i don't think I am, I really don't want to take medication (prozac etc). I have a scientific mind, so when It comes down to the wire and it gets bad, I always tell myself your a smart guy and no your not gay, relax, and so on but this only helps for so long until I begin another cycle. I am sorry if my story is a little jumbled, I am at work and am writing as quickly as I can.