Urinary Incontinence Support Group
Urinary incontinence is the involuntary excretion of urine from one's body. It is often temporary, and it almost always results from an underlying medical condition. Stress, functional, and urge incontinence are the most common forms. Share with other support group members and learn from their stories and experiences.
Here is one that looks to be much better for your situation: http://www.theraquatics.com/adult-swim-diaper.html
Also, the SoSecure swim diaper has been around for a while, you might want to check it out: http://www.theraquatics.com/soadcoswbr.html
Let us know if any of these work out for you.