I am a 4 yr. stage 4 cancer survivor who has constant pressure on my head, getting dizzy when standing up, or bending over. It started after new yrs. party, I got pretty drunk. Now I m starting to stagger when walking. I m 64, will be 65 in april. I m tired and sleepy alot. I take leviathroxin since radiation. 125mg per day.
You should go for clinical examination and few tests to know the cause of dizziness. Don't stop taking thyroxine. This may not be related to cancer at all. And there are so many reasons for dizziness in this age group and should be evaluated for the cause. Don't neglect in going to see the Physician.