Angie, I’m so sorry to hear this. I experienced a problem due to MS referred to as Bladder Retention, whereby I was unable to pass urine and collapsed on the stairs when I tried to crawl out of the bathroom. As a result a call was made and I was taken by ambulance to A&E, where they realised that I had 1.7 litres of urine inside, putting pressure on my abdomen. I woke up on a hospital bed, and the urologist had to put a catheter inside, up the urethra, to drain and keep draining by abdomen into a catheter bag. If you had problems going to the toilet, it can send your body into shock, where “passing out” is your body’s way of shutting down.