Okay, Topamax has a warning about it...involving bicarbonate levels. Does your doctor test your bicarb levels periodically?

Many doctors have ignored the FDA and company warning letters about this.

I'd get a Vit D test anyway, and also while you are at it, get that B12 and folate tested (B12 should be over 400pg/ml and not reported to you as
"normal" which doctors still do. Levels below 400pg/ml still are called normal but can result in nerve damage.

Did you ever take Dilantin before long term?

The drugs you take are too new to appear on the PN lists yet. That means there is not a definitive answer. But Topamax is hard on the kidneys, and can cause acidiosis by lowering bicarbonate in the blood, and acidosis can affect nerves. It also can cause glaucoma in the eyes, so you need to have eye check ups at least once a year and better every 6 months.

More details here:
http://www.pdr.net/drug-summary/topamax?druglabelid=947
I'd discuss this with your doctor.