I suffer from IBS too. Only d* though. I'm under a lot of stress at the minute and keep having constant flare ups. It's driving me mental as everytime it starts, I'm convinced I'm ill then I stress even more, then the acid reflux kicks in so I have problems both ends. I can completely sympathise with you. If you suffer IBS-D, then it is more than likely just a flare up. I too have awful gas/pains. Its the rumbling that does it for me but 9/10 its just gas moving around! When you release it, it should start feeling better