Hello,
I've been having problems with overthinking for quite a while now, but lately it has gotten worse and it expanded. It's like a never ending circle: I think of something minor, like the name of a youtube video i want to watch or some sentence/word. But then I forget it, my short term memory has gotten worse too, probably because of stress so that is why.

And when i remember what I thought of, if I even remember it at all, I start to repeat this name or a seemingly random sentence or word that I previously forgot in my head over and over and over again. I can go like that for a few days nonstop. I always repeat it in my head and it relieves my anxiety from this for like a few seconds, but then after a little while I have to repeat it again and again.

It has become really bad in the past two months and I don't know what to do about it anymore. These thoughts aren't usually anything violent or inappropriate, it's just 'random' words and sentences that I don't wanna forget even though they don't mean anything. This repeating of the thoughts in my head goes so far that im just sitting somewhere only focusing on saying these words over and over again until my head hurts.

It has become really bothersome and I don't know if i should visit a psychiatrist because I didn't find anything on the internet about this, my friend told me it could be OCD, but all i see with OCD is violent intrusive thoughts. And in like the past week, I've been having an urge to try to harm myself too, even if i dont think that I am depressed. I am also tired during the day and don't sleep much.

I always have pains and aches in my body and I am constantly worried I might have a serious illness, like brain cancer or something. Sometimes I have chest pains and problems with breathing + heart palpitations I would really like to know what is wrong with me, I haven't been to a psychologist/psychiatrist yet and I don't want to waste their time with something that wouldn't be serious. I told my parents, but they didn't care much.

Thank you, if someone shares experiences like this, could you please tell me what this might be? I feel like I have a broken mind...