Low b12??

So ive mentioned my weak and sluggish arms and legs also my jaw in a previous post. I told the doctor again and he told me to go to my pcp. I will be making an appointment in a week when one of my parents are off.
I did read some stuff online and im not sure but does anyone think I could have a vitamin b12 deficiency? My hemoglobin started to trend down last month 10.7 then after a week they checked it again weny back to 11 and now is back at 10.9. These numbers seem good to me so I am not to sure it could be b12 or not. Do you have to have a low haemoglobin to have low b12?
My balance was off not what it used to be. If i needed to say stand on one foot to i guess move somethinf I lose my balance quickly.