i am 46 yr old status post gastric bypass 6 yrs ago and never a problem. Developed severe anemia and underwent a hysterectomy 2 years ago. Diagnosed pernicious anemia take b-12 injections biweekly. Also take accupril, actos, tricor, hctz QOD,a1c 6.4 and a handful of vitamins d, chelated iron, niacinimide, magnesium, calcium, potassium, baby aspirin. Dehydration a problem on bactrim for UTI. Was diaphoretic, hot and cold, stomach ache, dark stool, and bp dropped to 80/40. Felt a lot better after a 10hr sleep and passage of loose black stool. Spouse says go to ER, I say H and H always low not an indicator, cant scope DT bypass. I plan to rest tummy, liquids, take prilosec and let it heal.