Topamax Tingling Side Effect?

Hello All, I just started a low dose of the generic form of Topamax- topiramate, about a week ago. I have been on Keppra for over a year, and have multiple simple partials daily and the occasional tonic-clonic. I tried Tegretol and had a bad reaction to it, so the Dr. decided to try Topamax. I am still taking 4000 mgs of Keppra daily, and currently only taking 50mg of Topamax. I have already noticed an effect on my seizures- instead of having two or three simple partials I'm having one or two, and this is only after a week. However, I have also noticed an odd sensation in my feet sometimes, a sort of tingling. At first I thought that my feet had fallen asleep and were waking up, but then I realized that I wasn't in the kind of position that would lead to that sort of thing, so I'm wondering if maybe this could be some sort of side-effect from the new medication. It's not constant, and I haven't really been able to see if it's related to when I'm doing anything or sitting in any position or anything like that, but periodically for the last 2 days I've noticed the occasional tingly feeling in my feet lasting for as long as 10 minutes. It's not painful, but it is puzzling, and before I go bothering my neurologist again, I figured I'd ask around here and see if anyone else has had anything similar. Is this a reaction or side effect of the Topamax, or the Topamax/Keppra combination? Is it worth calling my Doctor? Thanks!