Youch - sounds sore!!
Unfortunately size estimates are pretty inaccurate it seems, so I wouldn't get too worried about a really big baby!
In the last few weeks my osteopath became my savious for getting all the uncomfy bits out. She was a miracle worker! Even got a pubic strain I didn't even know I had out, and it felt so much better afterwards.
Maybe try something like this?
I personally had a child that liked to kick my ribs.