Can you take topamax and Cymbalta at the same time?

My neurologist prescribed both Tegretol and Topamax at the same time to prevent my debilitating headaches along with Effexor. It wasn't intentional, but we were adding medications, and planning to slowly discontinue the other later. Neither Topamax alone nor Tegretol alone had any benefit for relieving my horrible headaches. 8 day headaches that were constant and ruining my life. When I take both drugs together, along with the Effexor (I'm not sure I have to keep taking the Effexor, but I and my doctors don't want to change everything around too quickly.) Anyway, I appear to have no negative side effects from combining Tegretol and Topamax. Both certainly make my sleepy and I need more sleep than most people, but I have my life back, in that my waking hours are now happy and almost fully pain-free!! A complete blessing. Even my doctor doesn't understand it.