Im so confused about my sexuality?

Ok let me start off by saying this, for 16 years of my life i was pretty much 100 percent sure that i was straight, i had probably thirty different crushes on girls over the years and one massive one that iv had for about 2 years. All my fantasies and dreams were always about girls (however i never reached orgasm in a wet dream i just got insanely horny and some stimulation but it never went on for long enough to get me to orgasm) and never once did i get a crush on a guy or have any early childhood same sex experiences. I had always taken kind of long to get off but i had just thought it was normal and a side effect of jerking off every day usually more than once, which had been going on since i was like 13. After i turned 16 in january we went on a ski trip and one of the days i remember i was in the shower trying to jerk off when i realized the fantasy i was having had a really big dick that was ******* this hot girl in my school, it freaked me out a little that i was aroused by a dick but i just blew it off and it soon got lost in my countless heterosexual fantasies. then about three months ago i was watching porn and was getting really turned on by this massive black penis that unleashed a massive load on this girl but again i blew it off as pretty normal. Then about a month ago i was in a macdonalds with a few of my friends and they were having this conversation about a girl that went from straight to lesbian and all of a sudden i was overcome with terrible circling thoughts that wouldn't leave my mind and ever since then iv stopped finding girls as attractive and have gone through such bad anxiety and depression my parents had to send me to a hospital. Their they identifyed what i had as OCD and they put me on zoloft. Ever since then the intensity has gone down but i still have these terrible and unacceptable thoughts and fantasies. Every time i get close to a cute girl i have an urge to hug and spoon her, especially the one iv had a crush on for 2 years. Despite this my sexual interest in female porn (especially lesbian which used to be my favorite) has declined and i need to watch weird or taboo things it seems like in order to get off fast like pregnant women, gay porn, or weird fetish things which all really freak me out. Especially the gay porn and i absolutely loath myself for getting pleasure out of it( the only part of the male body that i like tho is the penis, i do not find males faces or muscular bodies even remotely attractive). In movies and real life however i still find female attractive an males not so much, for some bizarre reason the clothed female body is more arousing to me than the naked female body. In the past i have also had instances of when i convince myself i have a terrible terminal illness, One time i had tingling in my elbows and hands for a week and a half so i flipped out and absolutely convinced myself I had MS. Once i found out that MS symptoms can be almost anything i suddenly started getting blurry vision and weird aches, tinglings and loss of sensation on various places around my body. Can someone please give me a hint to whats going on with me and if im turning gay, bi curious or just have a penis fetish?