Abdominal Pain

[BigWorm]

I have a question for you.  I have been to the ER 3 times in the last week.  On thursday, the 21st, i began experiencing abdominal pain and diarrhea and thought i had a stomach bug.  on that saturday, i saw bright red blood in my diarrhea along with the pain, and went to the ER.  they did blood work and a CT scan of the abdomen and said they thought i had an infection.  i was put on flagyl and cipro.  before i got my meds filled, the pain got so bad on sunday i had to go back to the ER.  they said to get the meds filled and i would get better.  I was feeling a littel better and went to my Doctor for a follow up on wednesday and was taken off the flagyl as he said i didnt need it.  the next day, thursday, i was in so much pain i went back to the ER.  another bunch of bloodwork and some pain meds through IV, and a stool sample, and the DR said he though i had C-diff, although the test was negative.  The c-diff test was negative twice, but the ER doc said that i fit the profile for c-diff, as i was on tetrocycline for about 40 days and then stopped taken it, and then the pain and symptoms came on.  the ER put me back on flagyl and ive been getting better, although the pain is still there, not as bad though.  the diarrhea isnt as bad either, and has been drastically reduced.  the 3rd ER visit was on thursday.  i went back to my doctor today and he said i didnt have c-diff and wants to take me off the flagyl again, but im hesitant cause last time he took me off of it i got worse.  he is sending me to a gastro doc on sept 30, but says to cancel if i get better.  any suggestions as to what is going on.  im 28 and this came on pretty fast.  im worried it could be something serious.  thanks