JoAnn, as I have posted previously, I developed an incisional hernia in the midriff section a couple of months after my liver cancer surgery. That was repaired in Dec., but 2 months later I had it again...and much bigger this time. It looks like I swallowed a basketball. Am awaiting the 2nd repair. What I am now doing, and suggest for your husband (since it's an umbilical hernia) is to obtain an abdominal binder. It wraps around the stomach and has velcro to close it wherever it feels most comfy. I didn't wear this after the first hernia repair (I had asked them for one...they didn't just give me one or even suggest it), as it felt uncomfortable. However, I assure you I will wear it this time. I am wearing it now when my tummy starts to really bulge (such as after eating.) I also got a waist cincher with stays and hook and eye closures, which is so tight I cannot tolerate it more than a couple of hours, but I wear it when I'm going out so that my clothes fit right and I don't look pregnant.
Since my hernia is higher than the bellybutton, they don't feel it's in danger of being strangulated, as can happen with an umbilical hernia or inguinal hernia. Since your husband's is umbilical, you must check for hardness, inability to reduce it (put it back in place), fever, or severe pain. These are indications of a life-threatening problem! However, if you can get a belly binder for him, it should ease some of the discomfort of the bulging and prevent it from getting worse.