Lots of times when I'm having a meal I have to stop eating to "go" i never really get pain, I just get the "urge" and know I have to go, it's rather annoying and can be a real appetite killer for sure not to mention the usual embarrassment factor that always goes along with having bowel issues.
Pain varies for each, I've never gotten terrible stomach pains with having IBD and IBS as well, but the pains I get are in how the urges in my rectum feel and when my flare is bad the pain mirrors that, when I'm not flaring then it's not painful.