Lactose Intolerance Test?

As of late, I have been getting an increased observable fact of a troubled stomach. I believe it may be related to lactose intolerance, as I have a cereal everyday before college which obviously contains milk. As I type this, I am downing the last sip of a glass of milk merely to see what happens. If I show symptoms, i'll assume I am Lactose Intolerant.
'm lactose intolerant, what can I do to substitute my breakfast cereal? What can replace the fast, easy-to-make cereal I have every morning? It have to be pretty fast to make, so toast isn't really an option-- i'm on a tight schedule. Any back is much appreciated. Thanks.
Answers:    soy milk (vanilla or plain)
rice milk (vanilla or plain)
Lactaid milk (expensive)


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