Sexual OCD. Studying if i am depressed!

I am studying MBBS. I am under escitalopram and mirtazipine for the past 6 months because I am under huge anxiety during exams and I have avoidance behavior where I just stop studying if I am depressed regarding exams because I have lot of backlogs. The real problem is Im not able to concentrate in daily life because of OCD. I have had OCD of different kinds right from childhood where I thought I was an adopted child and I would fret when I think about it. Because i was small i dint tell my parents and it gradually weakened. During early college days i had this obsessive thoughts that i may be homosexual when i find someone good looking. It would stress me a lot and i would find solace in porn again by watching beautiful women.To be very honest i do not like to have sexual relations with a man. Now suddenly for the past few days i have been getting pedophile OCD. When i was in my pediatric posting i saw this cute 12 yr old girl which sparked obsessive thoughts like do i like that gal