Flagyl and meds

I just finished a 10 day (4xday) prescription of Flagyl (250 mg) prescribed by my Gastro doctor for treatment of (SIBO) Severe Intestinal Bacterial Overgrowth. Two days after finishing Flagyl I broke out in hives all over my body and my upper eyelids were very swollen. Now my dermatologist has me on Zyrtec and Prednisone. Has anyone broken out with hives and had swollen eyes from taking Flagyl?

I was in hospital for 16 days - no food no water - had flagyl and levaquin in IV form - i had pancreatitis - my gall bladder is fine - they did every test imaginable to me and gave no reason for the sudden flare-up of pancreatitis - i do not drink at all - my hubby is 27 years into his recovery = the meds made me feel really weird - like my tongue was dissolving like alka seltzer - my tongue was coated totally green- i kept vomiting and feeling so exhausted but i could not sleep - how can they fda approve drugs like this?