I used to get pain and heat with DS1 but when i had the twins i had a different doctor who said that my first scar was a bit of a mess and that she would fix it for me. and for this time my scar is almost gone and no pain.
but maybe you just need to help your scar mend maybe try to use some bio oil.

i know people who still have a little pain after a couple of years, 6 months isn't long to recover after major surgery.