The only time I have experienced this is when I am in a anxiety producing situation. For example, I am extremely claustrophobic and have been for as far back as I can remember. While I have gotten better over the years (elevators don't freak me as much.), MRI's are not my friend. My last MRI was a couple of weeks ago. I did have this exact feeling until the sedative took effect. Then the feeling went away. For me it is that fight or flight feeling.

However, I do have permanent nerve damage in my stomach. The MS hug is a constant companion for me; everyday at varying degrees. It's nice to know that MS loves me so much it wants to "hug" me all the time. LOL.

Anyhow, my stomach does not function properly (don't feel hunger, I feel full all the time, and a lot of times I don't digest my food all the way which kind of hurts when it's going through the digestive tract). This does create problems other problems for me.

One of my friends and her sisters have IBS. I know that during discussions each of them have said something about a feeling that they get right before they need to "go" (and quickly). I just can't remember how they described it. I'll ask her when I talk to her.

I would definitely bring it up with your doctor though. Sometimes the littlest thing is actually very important. Giving a doctor the whole picture can be helpful when trying to diagnose a symptom.

Wishing you the best.