Hello...I'm new here. My doc diagnosed me with IBS about six months ago, just by listening to my symptoms(no tests, though he did check for blood in the stool in the office which was negative, but I don't know how thorough this is). My dad died of colon cancer last August, so this whole thing really scares me! I seem have to episodes with this-feel normal with normal bm's most of the time. This last episode has lasted about two weeks-last week being diaherrea, now the last few days constipation with very little bm. My stools tend to be small and sometimes thin and Ihave some mild abdominal discomfort-no pain. My doctor put me on Hyoscyamine-anyone know anything about this? Does this sound like IBS?? I'm thinking of scheduling a colonoscopy (I'm 34) but am really afraid of them finding something worse, just because I'm overly paranoid. Another question-I remembered someone telling me once that the color of the stools was important for some reason. Any idea??I'd appreciate any help you guys could give me-you seem to know your stuff here! I'm laying awake at night worrying about this!