I've Had Arthroscopic Surgery On My Right Knee For Meniscus

I've had arthroscopic surgery on my right knee for meniscus tear and arthritis. For a while I was doing great in therapy. Now im having quite bad pain after walking and a nagging ache when I rest. I'm taking Daypro for pain and alternating hot and cold but the pain is still pretty bad. Its been 5 weeks since my surgery.