Deeleigh,
Sounds like it is time to seek a second opinion for your THR, from a surgeon specializing in Revisions, they have the education and background to determine what is happening with troubled hips. Look for a surgeon specializing in complex joint reconstruction or revisions. They should have no relationship with your present OS, not even golf buddies.
You can start with our surgeon locator at the top of the page.
Beyond your having a hernia, your back needs to be checked, as it could be the source of the pain you're are experiencing.