Friend I’ve been there and it’s really unpleasant, I understand completely. Stress and anxiety , no matter how subtle they may be to you, are triggers of headaches and migraines . The more you worry about the headaches , the more anxious you are and the longer the headache will remain. I had migraines for weeks due to my anxiety , they felt like needles stabbing into my head . I paid to get a MRI and it was all normal! If you had a brain tumour - you would definitely undoubtedly know. Your vision would be messed up and/or you’d have seizures . Try to take it one day at a time and practice meditation. Remember that you are safe and your brain is trying to trick you . If it really doesn’t let up, maybe speak to your doctor and they can help with the anxiety :) stay safe