Why does ocd feel so real

I have been have the same headache for a week now. I have never had a headache for this long before and it is really scaring me. I went to the doctor a few weeks ago about my thyroid turns out i was fine. Now I made another appointment about my headaches. I am terrified I have a brain tumour. My family all laugh at me and don’t take me seriously anymore when I see i am worried I have this, because all the times i thot i was dying i wasn’t. But this time feels way to real and so concerning. I don’t wanna die and I am scared I have a tumour but no one not even my doctor will end up taking me seriously because I am always making appointments for a new thing. But what if I do have one and everyone just sees me as the boy who cried wolf.

I’ve struggled with medical OCD for most of my life without realizing it. I feel like as a kid I always heard stories where people listened to their gut instigating and it was correct and they saved themselves. I remember overhearing my mom talking about a boy who had hit his head at a soccer game and told his parents “I need to go to the hospital something is wrong” and it turns out he was bleeding in his brain and needed immediate surgery. My mom said “it just goes to show you need to listen to your body”. I am constantly listening or watching, particularly when I’m under stress. Of course all of the extraneous symptoms are almost always the result of my anxiety (finger tingling, chest pain you name it anxiety is probably the cause). I’ve trained myself to take this line of rationalization when such symptoms appear. It terrifies me because how will I know something is really wrong when I can’t trust my own brain. I feel like I’m fighting a battle against myself all the time. I just want to know that I’ll be able to take care of myself but I can’t know that for sure.

I was recently diagnosed with OCD a little over a month ago, but I've had the symptoms as long as I can remember. Currently struggling with really bad health anxiety, and I'm absolutely convinced I have cancer. I've had a host of odd symptoms, I've seen every specialist in the book and nothing regarding cancer has come up. But I've had a hoarse voice for about a month now, and ended up scheduling ENT appointment. It's so hard to focus at work because I'm so sure I'm going to die. But I've been so sure every other time. I just don't know if my symptoms are real or not. I physically can see and feel differences but nothing comes up. Does anyone else struggle with this? I'm still waiting for my first ERP appointment.