Yeah, I think the phrase, "you have a hematoma and a lot of scar tissue" says it all. You may have internal scar tissue that has caused structures like bowels to adhere together in ways they aren't supposed to. Do you ever have constipation or pain and cramping after eating? Those a good clues to possible intestinal adhesions. As frank1229 mentions, one or more nerves may be entrapped in scar tissue.
It's just a travesty that other medical "professionals" have blown you off, but you're far from alone in that kind of treatment. Can you go see another doctor out of town?
A hematoma can be ugly and slow to mend. Sometimes surgery has complications that they don't tell you about until it happens because it's rare. Of those I have known who have had hernia surgery, most come through just fine, but sometimes it gets nasty. My ex-husband had three surgeries before they got it right, but they stretched the mesh so tight that he still can't lift anything without pain. I hope you heal well in time, but don't be afraid to seek another opinion, even if you have to leave town to do it.