What Causes Passing Of Blood In Stools After Taking Diet Pill?

i was taking a diet pill called acai berry clense for almost 2 weeks but also taking prilosec for my acid reflux, last friday i went out and drink beer then at sunday when i poop there was red blood on it, my poop was a soft one and normal color poop with red blood on it, but i ignored it coz i thought it was just my period, then next day i pooped then the color was light brown and redish..and my period was already over, then tuesday my period was normal, i was checking signs for blood on it but didnt see it...then wed, i see my poop it was a little pinkish...then just awhile ago i was stressed out coz my sister was in an accident when i pooped it was dark and has blood on it and smells really strong...smells different from my normal poop..im planning for a check up for tpomorrow but afraid for the result..what should i do?