Long periods

Just wondering if anyone finds this strange. Growing up I have always had difficult periods that would have me in bed for atleast 3 days. My periods are normally 5 days. For two years my periods are beginning to go from 6 to 10 days. Never been pregnant. I've been married for three years now and I will be seeing a doctor in two weeks. I always know what questions to ask when trying to get the right help but for the first time I am clueless and last year I was simply told this is normal but that is when my cycle was 7 days. The ladt thing I want to hear is this is normal because I do not think it is. Help if anyone knows what kind of test or right research I should be looking into before I go see the doc. Thanks