Have you seen a urologist yet? I believe there is a connection although I can't explain it. I was diagnosed with IBS which started out D, went to C, and then a mix of both now, I feel mine is very dependent upon my anxiety. This all started at 18. At 19 I started having frequency and urgency with my bladder. I had testing, never came positive for a UTI but the exact same symptoms. I was diagnosed with Interstitial Cysitis. Basically an inflammation of the bladder walls. I reccommend going to a Urologist and getting checked out, make sure they know about your IBS. Good luck. Also, try to eliminate caffiene, carbonated drinks, alcohol (or moderate it like i do ) and acidic foods such as lemons, limes, etc. Hope this helps!