Bad Anxiety 😢

I’m 18 and I have bad anxiety related to my health. I panic when I feel anything out of the ordinary. I ran out of my anxiety meds and my doctors away so I have no way of getting them. I’ve been off of the meds for a few days and the past few days my head has felt weird. It feels fuzzy and off. I can’t tell if my anxiety is making me overthink or if somethings wrong w me, I keep panicking over it being a brain tumour. What should I do? Advice please!