Normally when hernia repair
is done, it stays there for life that is why the sutures used are non-absorbable and firm enough to support years of abdominal pressure/tension. If you have gained weight that much and you are feeling uncomfortable then that is a practical problem that might need some correction. Normally the threads used are firm enough but they can give way with time, so a risk of another hernia recurring. In my knowledge there is no known medically design way to determine if your sutures need replacement and by the way, replacement is not programmed after a hernia repair in such conditions except another hernia develops from the same spot. I suggest you discuss this with your surgeon or doctor and maybe you will have to take the option of loosing some weight by taking a weight loss
program as you understand that weight gain or overweight
is not a good sign (with respect to your health and other health complications that come with it).
Hope this helps