As Keri mention on the other thread, it is never normal to have bloody diarrhea. Please watch yourself carefully and make sure to take the antibiotics as directed... and to take ALL of them.
You should probably take probiotics too. Those antibiotics and having so much D is flushing out the good bacteria from your intestines. They really need to be replenished to get your guts back on track. If you take a supplement, or eat yogurt, you might want to wait at least a couple hours after you take the antibiotic. If you don't wait then the antibiotic will kill off the good bacteria which will be counter productive.
Co-Moderator for the IBS Forum