Hello. You mentioned being seen by a pediatrician. Are you a person under 21 years of age? If so, you may wish to see a pediatrician endocrinologist. When my now 26 year old daughter was in high school she was diagnosed by a pediatrician endocrinologist as having "off the charts" celiac disease. It wad a serious "wow" moment and thr reason for her constant G.I. issues and her missing so much school--truly a parents' nightmare! I am in no way implying that is your situation. Simply a personal rec to see such a specialist if you are a younger person.
I have IBS-C and do not have bloody stools. I have severe constipation, major bloat, nausea, etc. I have tried everything under the sun in terms of OTC and Rx meds. They only serve to bloat me more. Haven't yet found a G.I. doc who wants to solve my puzzle. Needless to say, it has impacted my daily life activities and makes me miserable.

Good luck to you!!

Beth