Thanks for posting your query.
Well looking into your problem it doesnt seem to be rheumatoid arthritis
related issue . You injured your hip by twisting it that led to the pain . I advise you to consult an orthopaedic surgeon
and get your hip evaluated for same so that it is clear that it is just a muscle injury
or there is more to the problem, probably an X Ray
of the joint needs to be done. Regarding your sensation of cold fluid running down it sounds non specific and first you should sort out your hip problem . Be in touch with your rheumatologist
for regular assessment of disease activity.
Wish you good health.