<human>: Last Tuesday I had food poisoning, initial symptoms included fever, stomach cramps and very water diarrhea. The fever only lasted the night but the diarrhea persisted for 2 days and I eventually noticed some blood in my stool. 

Between then and now some symptoms have come and gone:
   - Vomiting with coffee ground staining - lasted 2-3 days
   - Very very dark green mucas/tar like stool - lasted 2-3 days as well
   - Complete inability to eat - lasted a week

I am now constipated, still am bleeding, still have stomach pains and have absolutely no appetite, but I can eat and can also keep it down, but the portions are very small. I know I have a hemerrhoid I've seen it, its slightly hanging out when sitting on the toilet but easily goes back inside and is what I assume is the cause of my bleeding. 

 - To describe it if you joined your finger and thumb together with one hand and tried to force your other hand's thumb and two forefingers through, that what I am seeing.

My question is could this be causing a blockage, stool is getting through, and I can pass gas and I am not vomiting fecal matter, but I get very bad lower stomach pain - below the belly button - and go through a routine of nothing with come out on the first sit but blood dripping, followed by more pain and nothing, followed eventually by the urge to need to vomit which then expels out the backside, and most the time the stool is dark brown but with the same consistency of tar/mucas. 

I have a doctors appointment next wednesday but is this something more serious? After it passes im fine for 2-4 hours then i repeats.

Can you condense the text into three sentences or less?
<bot>: Following food poisoning and water diarrhea bleeding occured from a hemerrhoid and now feeling impacted. Is this just constipation/the hemerrhoid or something but serious?