Hi everyone! I'm so glad I found this site. I'm 40 years old, female, and just had my third child five months ago. About six weeks ago I started having strange symptoms of pain in my abdomen that would come on at strange times of day and night and then go away. Sometimes there was painful gas, but normal b. m. Soon this started being accompanied by diarrhea, most often in the middle of the night. My father used to have IBS in his 40s and 50s but it went away, so I just kept passing it off as that. However, in the past three weeks things have gotten worse; many more rounds of diarrhea (the ones at night are the worst--they usually strike between 2 and 3 a. m., about 7 hours after my last meal--it's the painful cramps/spasms that wake me from sleep and then I run to the bathroom for the next two hours). I am up for two hours before I finally feel like all the trips to the bathroom have "gotten it all out". Then I usually start getting more rounds the next afternoon, leading to BAD ones in the evening. Between episodes of diarrhea, I feel a lot of dull cramping that comes and goes and LOTS of rumbling in my intestines. I have lost 8 pounds during this six weeks, most of it during the last two weeks. I rarely get fever, but sometimes in the middle of the night with the really bad episodes in which I keep going back to the bathroom, I do run a low-grade fever around 99.5 and I feel sweaty and drained. No fevers during the day, as far as I know. The D is very watery and explosive, but no blood, ever; just lots of pieces of undigested food surrounded by pure brown liquid. I haven't had a normal or solid BM in at least two weeks. I finally took Imodium last week and it did allow me to go 48 hours without a BM (Heaven!), but then when I had one it was the same consistency as before. I haven't done much experimenting with foods yet; I have never had any food sensitivities before this. I have only switched to lactose-free milk but I do occasionally eat small amounts of cheese still. I went to the dr. four days ago, finally--he's an internal medicine doctor. He ordered blood tests and two different types of stool cultures. All the tests have come back as normal, so now he wants to put me on an antibiotic for five days and then if I'm still having diarrhea I'll go in for more tests next week. I have so much anxiety in the meantime; here are my questions. 1) Should I be relieved by the negative test results? 2) Can I rule out Crohn's disease? 3) The doctor said I shouldn't lose any weight or have any fever if it's just IBS, but doesn't it make sense that with food moving through me that fast and with so much liquid coming out that I'd lose some weight, especially when I'm also breastfeeding full-time? 4) I'm afraid to research colon cancer; I'm only 40 and have no colon cancer in the family except for my great-great-grandfather, and that was back in the 1800s. My parents are in their 70s and in great health.Wouldn't I have blood if it was colon cancer?5) Finally, why do you think the dr. is prescribing antibiotics? Wouldn't a parasite or bacteria have been picked up by the stool samples? If I have IBS, couldn't an antibiotic make all my symptoms worse?Sorry to make this so long; thanks so much for any advice you folks with more experience/knowledge can lend!