The tumor which assume such large sizes are most commonly ovarian tumors. When you realize what one or two pregnancies with 8 pound babies does to your body and abdominal wall, it is obvious that it does not compare to what happens when an 80 pound mass is removed.
I cannot comment on why you had an incision hernia. It could have MANY reason including poor nutrition, poor tissue to allow a solid repair, repeated coughing and many others.
Similarly, it is NOT normal to have EITHER "massive bruising inside " or "a large amount of liquid in mid-area and cavity of my abdomen". These MUST be investigated immediately as it may be an abscess, a sterile collection which may later become infected and become an abscess, an injury to bowel or kidney with spilled fluid contained in this sac or even evidence that your tumor MAY be coming back.
Once this fluid collection is corrected. You will require a conference between your general surgeon and a Plastic surgeon who performs abdominal wall reconstructions. You will require a MRI to see what muscles are left, what the size of the defect is and from them decide, if anything, can be done to correct your condition.
Having "lots and lots of extra skin " is not life threatening. It can be corrected AFTER all other factors are addressed properly.
Dr. P. Aldea