Concern about symptoms. Of symptoms!

I am a 20 years old boy. I am very scared and worried about a big disease like cancer, brain tumour from last 6 months. And due to this worry, I had MRI brain in January and the report was normal. But after that, I again worrying that I have a tumour so I again have a ct scan head at last week. So, please, convo me stop my anxiety about it And I am always worrying that I got a tumour after MRI after a ct scan Sir, I have MRI in January can that MRI completely rule out the chance of a brain tumour although in November Can I get a tumour in a few months And also feel some physical symptoms 1 a tight band wrapped around my head 2 tightness and pain in the neck 3 nausea 4 dry mouth 5 ringing ears 6 dizziness 7 restlessness 8 tense muscles 9 weakness 10 upset stomach 11 mild headaches from different parts in the head 12 eye strain 13 constant worry Etc What's the reason of symptoms