I am 43 and was diagnosed in May with Glioblastoma multiforme stage IV cancer.  I have had surgery, radiation and Pill and IV chemo since then.  Now over the holidays, I am starting to get dizzy.  Is this allergy or symptoms of the cancer.  My last MRI 2 weeks ago showed scarring around the hole they scooped.
Allergy is unlike to cause dizziness. Is your fluid intake adequate. If not improve it. If you have a BP apparatus please check your BP. Rule these out. Radiation and surgery can cause scarring and edema(fluid retention) in your brain which can cause these symptoms.