hello everyone, just wondering if anyone else has been taking this and having this side effect...

i have been taking topamax (topiramate) for over five years, but began taking it for migraine prevention at a very low dose, 50 mg twice a day. i continued well on that dose for many years, until my new psychiatrist (i think y'all call them p doc here?) began increasing the dosage to what i take now, 300 mg a day. he increased dosage to see if it would stabilize my mood, which it has (some). okay, now my problem is this... i sometimes have a hard time finding the proper word in my vocabulary for what i am trying to say. i know what the word is that i want to say, but i just cant seem to get it to come out!!!!!!!!!!!!!! it makes me very upset, i have always been very well read and able to communicate fully what i mean. i am so frustrated, because this is one medication out of ALL of the others that we have tried (and we have tried them all, it seems) that helps my mood any. what in the world is going on with me? am i getting worse? am i getting better? can anyone shed some light here, please? help?