Hello Practo User,
If HLA B27 has come negative, it is not Ankylosing Spondylitis.
Don't worry.
Most of the Arthritis cases of Rheumatoid etiology can be controlled by medications,but cannot be eradicated for once and all.
Next Steps
If you have more doubts about the problem, please meet a Rheumatologist and take opinion.
Regards.