My vicious circle that I want to get out of

There's been a lot of anxiety in my life lately... It's been there before, but... Now she torments me every day... I'm even used to it, and when I don't have anxious thoughts, I look for them to "think". To some extent, I can't live without them... I worry about everything, even my thoughts, which arise suddenly. And I'm about to start thinking and I'm going to be distracted from work again. I began to listen to myself: there was a pricking in my side - what if it was a symptom of a terrible disease? What if I don't go to the doctor I miss the onset of the disease? And it me in the side!! I understand that I am "definitely" sick!! I have a thick medical history, where it is written in detail that I am healthy. But it could be a mistake, isn't it that I sometimes feel nauseous? Isn't that normal? And I start imagining pictures of my funeral. And then... Thought, "How will my boyfriend behave at the funeral?" And if he doesn't care about me, I have anxious thoughts. I imagine that the guy will find another girl after my death... Jealousy wakes up and I call him and ask, "Are you sure you're going to cry at my funeral?" To which he yells at me that I'm going crazy and hangs up. And I really feel like my thoughts are going to drive me crazy. And I'm starting to think about whether I need to do a brain exam. After such thoughts, I begin to feel how "my brain hurts" and I feel really sick. I make an appointment with a doctor at the clinic... I'm starting to read about brain disease. And so the days pass... Just an enchanted krgug from which I want to get out..