Curious sacrum, hip, pelvic joint and surrounding tissue pain, help!

Treatment and medication
1

Dear doctors,

I have been suffering from what started as a sacrum pain in the right lower back, since two years ago, strangely, after an insect bite. Initially I had 1 episode of red bloody stools which disappeared and the pain went into remission. Pain flared up again and became worse upon the taking of caffeine and chilli. A GP prescribed Arcoxia with a few days of relief but strangely pain spread to leg after taking of inflammatory Arcoxia, Pain seems to be chronic. RA test showed no signs of arthritis, just raised ESR level of 27/20. One day, GP prescribed papain for relief of sorethroat and strangely, pain spread to left sacrum and spinal chord, tests showed ESR level had increased to 47. Medication was also prescribed for a gardnerella infection. ESR level remained high at 42 after treatment. Normal results for blood count tests. Having been a person involved in competitive sports since young and very familiar with sport injuries (e.g. gymnastics) but never having hurt the back before. from my viewpoint the pain experienced is a biting and dull, numbing pain, unlike any sporting injury like ache, tear, sprain, fracture. And back pain was sustained at a time of inactivity. No sports, no exercise during that period when pain was sustained. Please help this elusive injury.

2

Forgot to mention above that X-rays were done with normal results, no inflammation of the spine, and sacral bones were shown. MRI not done yet, but might be next step, pending specialist's advice. Specialist initial diagnosis was mechanical pain, however original GP advised not to pass off back, sacral, hip, pelvic pain as mechanical. Other inflammatory markers blood tests also done with normal results. Please advise.

3

You mentioned the bloody stools... did you have a colonoscopy? If not, it needs to be done as well as an MRI. If both come clear, may want to consider a pet scan. Good luck!

4

Thanks Diane!  I didn't have a colonoscopy but I kidney function tests were done. Colonoscopy was not recommended by my doctor as the episode of bloody stools did not repeat. Will ask my doctor about PET scan.