incisional hernia

Almost 2 years post op.  The most I lost was 90 lbs.  I discovered my hernia at 4 mos. post op.  Weight loss continually slowed.  I gained 20 lbs.  I'll be having surgery in April for repair.  I can't help but think it's due to the hernia.  Would anyone have any information on the subject or know where I may find information?  I'm getting very discouraged.  Any medical professionals I've spoken with  will not seem to commit to an answer one way or the other.  Thanks.