What am I doing wrong with my teeth?

Hi. So, I am a bit weird about my teeth. I am borderline obsessed with keeping them healthy. I have nightmares of tooth decay and... yah it's weird I know lol. Anyways, I brush very well. However, I drink tea everyday all day which can stain your teeth. I noticed that I have a little plaque a few days ago and I have been brushing even more frequently and much harder. When I woke up today part of my gums hurt really bad. I went to brush my teeth and noticed that in one spot my gums are really swollen. I have brushed my teeth 3 times since then and now my gums are kinda bloody in that area (they aren't bleeding but they look raw and bloody.) I'm freaking out lol. What am I doing wrong? What is happening?