It's very likely that you have spondyloarthritis, but can be confirmed only on the basis of detailed history and examination. If you get pain and stiffness realy in the morning that gets better with activity then probably you have this condition. hLA B27 positive is only supportive in diagnosis not confirmatory.
Next Steps
You should consult a rheumatologist , as you might need higher drugs to control pain, as you you are constantly taking pain killers which may be detrimental in the long run