Firstly, excuse me for any flaws in my English writing.
I'm a 16 (almost 17) year old male. A month ago I had a gay thought pop into my head of 2 guys being together. I suddenly got a big anxiety spike and got really scared when I thought "What if I find that attractive / arousing?" and "What if I'm gay?!". I still managed to tell myself that this will be gone the next morning and managed to fall asleep. But I was very wrong and the torture began. The next day I started googling my problem and found HOCD. I felt relieved, I finally found out what it was and I told myself "See, you're not gay." It worked. For 15 minutes. Shortly after, I was so anxious, depressed and scared I had to tell someone as I could not cope with my horrible feelings. I told my mother and grandma. My mom tried to calm me down by saying that she never saw any gayness in me and never suspected I could be gay. But she said that even if I was I would have to accept it and there would be nothing wrong with it. But I didn't even want to hear the last line, although she calmed me down for a short while. How can I accept something I don't want to be and never were? I am 100% sure I never was gay, never had gay thoughts, feelings, never got aroused by men, always watched straight porn, looked at girls, even had a girl crush from my school when I was 14, and I always only hung out with male friends. I was always too shy to even talk to girls. But since the day this started, I started doubting everything.
Every day I would check out every guy I saw on TV, the internet, on the street, to check for arousal or attraction. And I still have no idea what I was. I could only sit on the couch all day and thing about "Am I gay/bi?". I was so depressed for a week. I spent whole days thinking and crying. At some points I was 100% that I was gay and the anxiety was even worse. I even started getting groinal responses when checking. I watched gay porn once, to see that I do not get aroused, but I think that I maybe felt an erection, I can't even remember anymore, I quickly turned it off as I got a huge spike and the anxiety got even worse after that.
After a week of crying, my mother called the doctor. She sent me to a psychologist, who told my mother I had OCD after I told him about everything. He then sent me to a psychiatrist who I had to tell everything too and she put me on medication. I've been taking 50mg of Sertraline for a month now. I've been on vacation for 10 days with my family, on the seaside, and although I still checked every guy I saw, I felt like I can forget it much quicker and felt much less anxiety. I still wasn't sure what I am, though. I could do things I liked again and the depression was mostly gone. For the last week, I'm home again, and I feel like it has gotten worse again. For the past 2 days I have intrusive thoughts more often again, and at some point I felt like I was 100% gay again after checking. I started to read the forums for reassurance again, as I found myself in all of these HOCD posts. But this only helped at the start. I don't know what I am or what I'm feeling anymore. I just don't want to be gay or bi.
I started doubting that I have OCD too and that it's just an excuse for not accepting the truth. And I thought to myself "What if I am just homophobic or scared of the society?". But I don't want this to be the reason. I just simply don't want to be gay. But my mind is telling me that I am. The past day I've even had a thought about being transgender (TOCD) and got another spike. Why do I have to have these thoughts? I feel like crying writing this

During this I've also had an anxiety spike when I heard quiet distant sounds and thought that they were not there. But they were. I think this is called ShizOCD. Then once, I was looking at a little girls and thought "Why am I looking at her? Did I just check her out? Am I a pedophile?" (POCD). Also, just once, I was in panic when I thought "What if I want to kill myself or somebody else?" (Harm OCD). Before all of this started, I always had fears of me or my close ones having cancer or a deadly disease, every time I found some little lump or something on my body. Also, every time I touched something, I thought my hands were dirty and had to wash them before I did something else, but I never thought this could be OCD and it didn't really take my time or bother me. I probably have a milder version of Social anxiety aswell, because I never feel comfortable talking in front of people I don't know well, as I feel like they will think I am weird or awkward and that they will laught at me.
My mother was on anti-depressants after the divorce and my dad's stroke (thankfully well and improving). My brother says he has an abnormal amount of anxiety and wants anti-depressants, but it's not very severe. My cousin had social anxiety and she thought she is going to die and took anti-depressants. My grandma is an alcoholic and told me she was depressed and had suicidal thoughts.
What do you guys think? Should I feel no response and reassurance after checking? Because I don't and checking just makes it worse if I get groinal responses. Am I gay in denial? I feel like I couldn't live with that and that that isn't really me.
Thanks for any answers.
p.s. I know I'm just looking for reassurance, which is not going to help in the long run, but I just have to write this. When I read or write about OCD I feel like I have it and I'm not really gay. Sorry for the wall of text.