Why do i feel as though i am loosing my balance and feel dizzy when i try to walk with my eyes closed, or when walking in a dark room? i've never felt like this before?

Your symptoms warrant evaluation by a neurologist. Just in case it is due to dehydration, drink enough water daily so that your urine is mostly colorless. If that does not help, it would be prudent to see a doctor. Wish you good health!

Many causes of imbalance and dizziness, and not feasible to be precise. Your description might suggest proprioceptive issues secondary to posterior column issues like B-12 deficiency, but even inner ear dysfnctn, or medication reactions could explain this. Worthwhile to see otolaryngologist or neurologist and track down answer.