I’m scared i have a brain tumour

So basically, every day for the past two months i’ve woken up with a constant permanent headache and now i’m getting nausea most days. My neurologist who i see for psychological issues and my mum now think i may have a possible brain tumour and its really starting to scare me since i have quite bad anxiety already. Even when i get a severe headache or a migraine the migraine tablets i was given do not always work. Now i have to have blood tests and a brain scan and i just feel so horrible because my mum’s doing it privately so its all costing hundreds.

I don’t know if i’m more scared that something will show up on the results or if nothing will show up on the results (if nothing shows up then its just anxiety induced headaches and there will be no cure) and if there is something on the results like a brain tumour or something i could yk like die and its scaring me so hard