I once had excrutiating pain in my abdomen after eating and it lasted for like 3 hours. Its was like someone had stabbed me in my abdomen.
Yep, I can definitely attest to this.
I had my first gall bladder attack after eating greasy food about 2 1/2 years ago. I came home and over a period of about 20 minutes was doubled over in pain so bad that I was taken to hospital. I was hit with 4 shots of morphine just to settle me down. Over the next 24 hours I had several tests done and it was an ultrasound that revealed the gall stones.
You'll notice they will flare up a lot more after you eat certain foods when your gall bladder tries to eject bile into your stomach to assist the digestion process and cannot because the stones are blocking the ducts - that's what causes the pain.
The easiest way to confirm the findings is simply see a doctor and get an ultrasound done - gall stones show up easily on such a scan.