Mine is low, could this be causing problems?

Most definitely! How low is "low"?

In fact some people are misdiagnosed with MS when in reality they have low B12!

I have a thread here:
http://neurotalk.psychcentral.com/thread85103.html

I think you need to explore why you are low.
Taking drugs that affect it?
acid blockers
metformin

No acid in the stomach?

Anemia? Pernicious anemia runs in families.

Malabsorption due to inflammation of the intestine? This can be from gluten intolerance or Crohn's disease, for example.

Fibro and MS have both been shown to have low B12 in the spinal fluid. So I hope you get this corrected ASAP!

Many adults after the age of 30 have trouble with "the intrinsic factor" this is what the body uses to pull B12 from foods, and if you are lacking, you will be low. Sometimes they need suppliments. Shots, or nasal gels to help bump it back up.