why is it that even folgers simply smooth ground roast coffee upsets my stomach when i like to put a ton of it?!

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Miz Kitty is on to something. Its not the acid in the coffee that makes your stomach all messed up. it's the pesticides and chemical they use to grow the beans. the commercial brands usually use harmful chemicals to treat their beans, which commonly causes upset stomachs in for people of all ages. there are some good organic coffees out there, but be warned, not all of them taste the same. either way, the best and easiest way to find good coffee, is at a local gourmet coffee shop. they will be able to help you select and find a good coffee.
good luck
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Natural occurring caffeine in coffee is not like the synthetic crap thats in energy drinks. i used to think that too much caffeine was the cause of my upset stomach, but its not. i used to order a a drink with 6 shots of espresso. the barista always teased me, telling me im going to haave a heart attack. in fact, thats what she ended up calling it my 6 shot heart attack. LOL. i would drink two of those a day. yummy. i would still be enjoying this drink, but the place ended up going out of business. =(
point being, if the cafffeine content was an issue, the 12 shots in a 12 hour period should have put me in the hospital. LOL. i was one wired puppy though. HAHAHA

coffee freak.

Don't worry about acidity; your stomach has a pH around 2, which is comparable to a lemon. If it gets more alkaline, it has to release more HCl to balance that out. The low acidity is basically to save your teeth.
I doubt it's the pesticides, and think it's more likely to be the caffeine. Too much caffeine makes me nauseous. Try what the other suggester said and cut it with decaf! If that doesn't work, then try the expensive organic stuff.

I'm a coffee lover (not a physician) and I also like mine black. Everyone in my family warned me that once I reach my late 30's or so, it will start giving me an upset stomach. They were right! I've tried the "low acidity" and "acid neutralized" coffees, but no luck. Still got an upset stomach. Then a friend of mine advised me to buy only organic coffees. She recommended Green Mountain Roasters for my Keurig machine and a brand called Yuban for the coffee maker. I order them on Amazon. I buy both caffeinated and a 50/50 Half Caff. blend.
It's been a few months and no problems. I'm not sure why exactly, but organically grown is the way to go for me. And I limit myself to only 2 cups. My parents buy their coffee locally from a man who roasts his own beans.They don't have any more problems with an upset stomach either. Might be worth a try. Good luck!