Fears of tumor.... :(

So I’ve had the most horrific headache for a long time now. This headache does not go away so I can’t keep a log of what triggers it. It is literally constant. With this headache it’s all over, terrible constant pain that goes to my neck. I stay so dizzy when I stand it gets worse and so does the pain. I’m terrified. I have a CT being done next week and I’m freaking out expecting the worst. Here are my symptoms. Please let me know or give me reassurance if you’ve experienced this too sad

- dull achy pain all over head, and down neck 

-light sensitivity 

- feels like I’m gonna pass out/lightheadedness extreme 

-nausea 

- a lot of head pressure