Can Scar Tissue from Plastic Surgery Cause Severe Pain?

I had a tummy tuck in April of 08 and my skin died so my Dr. did a revison in May of 08 to remove the dead skin. I still need a 3rd surgery, as he left dead black skin and it turned into a hole in my stomach. I packed it with gauze and it eventually got to be skin again, it still looks bad and they need to do another revison. I have awful pain in my stomach and was wondering if this is scar tissue causing me so much pain or could it be something else? My doc says I should not be in pain.

The best way for me to describe the pain is it feels like I am carrying a 20 lbs of hardness in my stomach all the way to my pubus area. I am in so much pain it's controlling my life. I still can't cough right- it's not a normal cough. Is a lot of painful scar tissue usual with a tummy tuck? Cause this hurts and I am miserable. Will it last forever? Can anyone please help? thanks jen