Vic...
It is not just you....I get the worst sore throat (and sorry to be gross...but I want to vomit...worse than I did to begin with 
)
The sad thing is...In my case the sore throat and the nausea is not worth the benefit of this medicine....
I guess this is one of those cases where you have to weigh the benefits out and see if it is worth it to you?
I am like that with Topamax...Kidney stones are hereditary in my family (I have had them 3 times) and they are common occurances with Topamax. HOWEVER, that is the only preventative that works really well for me, so I am up to 400mgs daily now. I have with my doctors permission decided that it is a trade-off...It is worth the RISK of kidney stones once every 6 months (estimated possibility) to not have daily migraines. So, that is the chance I take...
Anyway...you are not alone with the "zomig throat" I don't think it is dangerous or anything to be concerned with...At least it makes you feel better to know that its not just you.
Sara