"Sneezing" Bladder Syndrome & Fibromyalgia
It was interesting on my last visit to an immune specialist (rhumatologist, internal medicine) I mentioned how it seemed sometimes it would hit me very suddenly the need to urinate. We've tested druing those times without any indication of infection and this doctor called it "sneezing bladder syndrome".
"You've heard people say when they sneeze they 'leak' a bit? Well this is very similar except the mucosa lining of the bladder is inflammed without infection - so you can't wait to get to a bathroom or dash for one all of a sudden." He also explained during flare ups of both Fibro and Lupus this is very common, when in a more healthy state why you know you have to go and can wait long enough to get to a bathroom.
He said if its bothersome there are some medications that help keep the bladder muscle from "sneezing" (smooth muscle continuity) though can have contra-indications with other medications and health history so check with your doctor and pharmacist first.
Just thought I'd pass this along, it shed some light on why certain things seem more prominent during a severe flare up and can be helped with medication. I did ask about muscle exercise and if that would help, his response was you can't exercise the bladder muscle but can abdominal and kagle muscles to give you a few minutes time to get to a bathroom.