Well I have a stomach ulcer due to financial worries, where I was coughing up blood and crapping it too. In fact, when I heard it was only an ulcer, I was disappointed.
At the same period in time, an old pal of mine died of a burst ulcer
I know that lead ball in my stomach which seems to pull everything into it and weighs down my whole body.
That's a good way to describe that feeling.
Not that exact feeling, but sometimes I feel as though there is a brick in my stomach.