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Thanks for your question. The first person you should ask about this problem is your doctor. Only he or she can tell you the best way to deal with lactose intolerance. Before seeing your doctor, you may want to read this overview of lactose intolerance and this guide on some suggestions on how to manage your lactose-intolerant lisfestyle. They will provide a good starting point for your conversation.
In that conversation you should also discuss with your doctor your best option to treat your diarrhea. Here is an overview of some common treatments that you could discuss with your doctor to see what might work for you.
There is milk called Lactate available at most grocery stores which contains
the enzyme Lactose Bacillis which is what your body is mising, try it and see if
that solves your problem. Another one is called A PLUS Acidopholis milk , it also
contains the bacteria your body needs to digest the milk.