I have abnormal gait and loss of balance at times. i also lean to my right. what could i have?

Gait and balance: Problems sound significant, and you can start with your pcp. The differntial includes neurological problems of the central nervous system, benign but serious, to malignant. You will likely get a visit to a neurologst, for a formal neurological exam, before an mri, but the exam directs what to study, and if other things are first.