connection between Pure-O themes

Hello, I am new here and I would like to thank everybody for reading and helping.

Naturally, I have some questions and would like your opinions.

My story goes as follows:
I have been diagnosed with OCD by a psychiatrist, but he said it's the beginning of the condition and not so severe. It all started when I was in a relationship and the girls said she loved me, to which I responded in the same manner, though I didn't necessarily feel it. Over the course of the next week I was extremely sad and confused, couldn't enjoy what I usually enjoy and I was very restless: "what if I didn't love her? am I a liar? I love her, no I don't and so on".
I broke up with her as I couldn't take the mental torment. However, for almost a year I would have this knot in my stomach and feeling of despair 90% of the time I saw her. Again, her name kept resounding in my head without apparent reason. I was questioning whether I did actually love her, reading online about married people still in love with their exes, searching on how to know if you're still in love and so on. I had to stop watching How I Met Your Mother because of the anxiety (I guess?) that the romantic aspect caused me. I have a friend who used to be heartbroken over this one girl and I feared I was the same way, so I started doing the opposite of what he was doing, like smoking with a different hand.
Next, I saw an article of a footballer and thought he was good-looking, which again caused an extreme feeling of restlessness and started doubting my sexuality, which wasn't an issue prior to this incident, me never being attracted to men. It includes all the checking, doubting, sadness, groinal responses and so on, despite me not being attracted to men to this day. I also noticed that this is related to my school work. When I have an exam I get stressed and feel the need to do some things one way or the other. Wearing a certain watch, writing with a certain pen, mirroring the behavior of friends who got good grades and so on. Although not always.

My questions are:
1)Was what if felt during and after my relationship OCD? I feel like it was not and all I am doing is lying to myself, because I don't really have OCD despite what the doctor said
2)I have periods of ruminating throughout the year, whenever I am not ruminating I feel at peace, the thought are still there, although rare, but I am not really stressed.
3)I have never been in love yet, I am 20 years old and have no experience outside of that one relationship which lasted one month. Could this be a sign of anything?
4)Why do I still ruminate without feeling intense panic like I did before? I used to be on meds (sertraline) which made me feel much much better, but I stopped taking them
5)Why the hell do I doubt everything I have written and think it's just a scheme planned by my brain to make me feel like I don't have a mental issue?
6)Did I type question 5 just to convince myself that I am sick?
You get the drift.

I hope to get some opinions on this, hopefully it didn't trigger anybody, if it did, I am truly sorry. I am thinking of going into therapy again this summer, but in the meantime I hope to get some help here and help others as well.
Thank you!