I get that pressure on my bladder as well, no pain, just pressure. I also can feel lots of pressure even if there is just a little bit of urine in there, and then there are times when my bladder is totally full and I'm hardly aware of it and empty fine. This is another reason I am convinced that the IBS plays a huge role in urinary difficulties. Look how many of us have urination problems AND IBS? No coincidence I think!