Should I go to the emergency room?

On Tuesday night I started having an intense, dull crampy ache in my stomach, which came and went all night. Around 6am I was very nauseated and went to the toilet prepared to vomit but it didn't happen.

Until around noon that next day (Wednesday) I had that pain, it hurt to put pressure on my stomach too. It felt oddly full. I was nauseated but felt fine after around 12pm. I slept okay that night.

The next day (Thursday) I woke up nauseous and with the ache. It passed. I had a diminished appetite. I ate bland foods. 30 min after eating I get that gnawing crampy ache and feel nauseous and awful. it Comes and goes. It kept me up for some of the night. Friday was basically the same as was Saturday and today.

I've yet to vomit although I feel I might. My stool has been normal until just now it was a little soft and foul smelling. I have no fever. I am not pregnant.
Should I go to the emergency room?
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