i get really bad stomach pains on and off for periods of about a month, but they've never been as bad as they are this time.

i guess the list of symptoms simplified is this:
intense cramping and/or sharp pains in lower left and/or right abdomen (always after eating, sometimes even without eating)
vomiting an average of three times a day, more after eating meat (also, i haven't been able to eat beef for a few years now. it makes me so sick)
constant exhaustion, no matter how much i sleep
headaches, probably from all the pain
near-black diarrhea almost every bowel movement, which are usually once every 2-3 days
6 pounds lost last week, even though i've been eating much more than normal to try to maintain my weight

i have no symptoms of just simply being sick.
i don't have a fever, but i feel feverish. my temperature has been constantly below normal.
might i emphasize how the abdomen pain is constant and intense? it interferes with my daily life.

this has been going on for two or three weeks for this time.
also, i have a doctor's appointment tomorrow.
i just want to have an idea of what's wrong ahead of time.

Your symptoms sound so similar to mine except everytime I go to the dr they say it's acid reflux. I'm constantly in pain not just the lower stomach but in between my rib cage at the top, gas, belching and bad indigestion. It's driving me crazy because all the dr's want to do is give me meds and I'm tired of being sick!!! I hope everything works out for you. Please keep us posted. take Care and God Bless.

There are so many things that could cause your symptoms, you should really see a doctor. Black diarrhea is an indication that there is blood in your GI tract. this is serious. It could mean ulcers or much worse.

Get help immediately.