Have you considered getting a second opinion? I have had both hips replaced and one revision due to a loose stem. After my first THR I had intermittent issues with pain, and after three years it had progressed to the point I was left with no doubt something was significantly wrong. Prior to the revision I had multiple tests and they all came out negative for a problem with the implant - x-rays (multiple x-rays over time), bone scans, a dye test where they injected dye into the joint and took a scan to look for looseness. But the surgeon said it has got to be loose. He replaced the stem and it was loose - it just did not show up any of those tests. I suggest that you consult with another surgeon to find out why you are having so much pain and/or to rule out an issue with the implants.
I was discouraged that I needed a revision, but afterwards I felt great and still do - that was in Dec of 2014. My left THR was this past May and I feel great and am very active. After four months - and this is just my non-medical opinion - I would think you would feel better.
I hope you feel better soon.